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[HttpPost]
public ActionResult EditarConfSist(ConfSistMOD confSist)
{
    try
    {
        var repositorio = new ConfSistREP();
        repositorio.EditarConfSist(confSist);
        // gerar o log 
        logar = new LogREP();
        log = new LogMOD();
        log.NomeUsuario = HttpContext.User.Identity.Name;
        log.Login = VariaveisDeSessao.LoginUsuario;
        log.Dt_Log = DateTime.Now;
        log.IP = Request.UserHostAddress;
        log.HostName = VariaveisDeSessao.GetHostName(Request.ServerVariables);
        log.Acao = "Apelido " + confSist.dsApelido + " (valor = " + confSist.dsValor + ") foi editado com sucesso.\n"
            + "Detalhes: \n"
            + "Valor = Antes: " + repositorio.dsValorAntigo.dsValor + " \t\tDepois: " + confSist.dsValor + "\n"
            + "dsApelido = Antes: " + repositorio.dsValorAntigo.dsApelido + " \t\tDepois: " + confSist.dsApelido + "\n"
            + "dsDescrição = Antes: " + repositorio.dsValorAntigo.dsDescricao + " \t\tDepois: " + confSist.dsDescricao + "\n";
        //log.IdLogIdTabela = confSist.dsApelido.ToString();
        //string wRetorno = logar.InserirLog(log);
        TempData["Sucesso"] = "Valor editado com Sucesso";
        return RedirectToAction("ConfiguracoesDeSistema");
    }
    catch (Exception ex)
    {// gerar o log
        logar = new LogREP();
        log = new LogMOD();
        log.NomeUsuario = HttpContext.User.Identity.Name;
        log.Login = VariaveisDeSessao.LoginUsuario;
        log.Dt_Log = DateTime.Now;
        log.IP = Request.UserHostAddress;
        log.HostName = VariaveisDeSessao.GetHostName(Request.ServerVariables);
        //log.Acao = "Falha ao Editar valor " + confSist.dsApelido + " (valor = " + confSist.dsValor + "). \nMensagem: " + ex.Message + "" + ex.StackTrace;
        //logar.InserirLog(log);
        TempData["Erro"] = "Falha ao editar valor";
        return RedirectToAction("ConfiguracoesDeSistema");
    }
}
// Model
public class ConfSistMOD
{
    //RSS - 15/02/2019
    public string ID { get; set; }
    [Display(Name = "Apelido")]
    public string dsApelido { get; set; }
    [Display(Name = "Descrição")]
    public string dsDescricao { get; set; }
    [Display(Name = "Valor")]
    public string dsValor { get; set; }
    [Display(Name = "Tipo")]
    public Int16 dsTipo { get; set; }
}
//View
public class ConfSistViewModel
{
   /// model principal
    public ConfSistMOD Config { get; set; }
    public List<ConfSistMOD> ListaConfiguracoes { get; set; }
    //public SelectList Filtros { get; set; }
    public ConfSistViewModel()
    {
        //Inicializar lista
        Config = new ConfSistMOD();
        ConfSistREP confSistCaduREP = new ConfSistREP();
        this.ListaConfiguracoes = confSistCaduREP.CarregarListaDeConfiguracoes();
    }
}
//Repositotio
namespace DataAccess
{
    public class ConfSistREP
    {
        public ConfSistMOD dsValorAntigo { get; set; }
        public string EditarConfSist(ConfSistMOD confSist)
        {
            using (var conexao = new ConexaoBanco())
            {
                var tbConf = new tbConfiguracoes();
                tbConf.dsApelido = confSist.dsApelido;
                tbConf.dsDescricao = confSist.dsDescricao;
                //tbConf.dsTipo = confSist.dsTipo;
                tbConf.dsValor = confSist.dsValor;
                conexao.tbConfiguracoes.Add(tbConf);
                conexao.SaveChanges();
                return tbConf.dsApelido;
            }
        }
        <div class="form-group">
            <table class="table table-striped table-hover">
                <thead>
                    <tr>
                        <th>Apelido</th>
                        <th>Descrição</th>
                        <th>Valor</th>
                        <th>Editar</th>
                    </tr>
                </thead>
                <tbody>
                    @foreach (var item in Model.ListaConfiguracoes)
                    {
                        using (Html.BeginForm("EditarConfSist", "Lojas", FormMethod.Post, new { @class = "form-horizontal" }))
                        {
                            @Html.AntiForgeryToken()
                            <tr data-id="@item.ID">
                                <td>
                                    @Html.TextBox("model.dsApelido", @item.dsApelido, new { @class = "form-control", @readonly = "readonly" })
                                </td>
                                <td>
                                    @Html.TextBox("model.dsDescricao", @item.dsDescricao, new { @class = "form-control", @readonly = "readonly" })
                                </td>
                                <td>
                                    @if (@item.dsTipo == 1)
                                    {
                                        if (@item.dsValor == "Sim")
                                        {
                                            <select name="model.Dropdownlist">
                                                <option value="False">Não</option>
                                                <option value="True" selected>Sim</option>
                                            </select>
                                        }
                                        else
                                        {
                                            <select name="model.Dropdownlist">
                                                <option value="False" selected>Não</option>
                                                <option value="True" >Sim</option>
                                            </select>
                                        }
                                    }
                                    else
                                    {
                                        @Html.TextBox("model.dsValor", item.dsValor, new { @class = "form-control" })
                                    }
                                </td>
                                @Html.Hidden("model.ID", item.ID)
                               @* @Html.HiddenFor(model => model.Opc)*@
                                <td align="center">
                                    <button id="EditarSistConf" type="submit" style="border:none; background-color:transparent"><img src="~/Content/Icones/editar1.png" /></button>
                                </td>
                            </tr>
                        }
                    }
                </tbody>
            </table>
        </div>
    }
}

Rename your textbox, remove these
model..– Pedro Paulo
@Pedropaulo solved ! Now he’s giving another Exception .. Do you have any idea what it might be? : ( {"Unable to update the Entityset 'tbConfigurations' because it has a Definingquery and no <Insertfunction> element exists in the <Modificationfunctionmapping> element to support the Current Operation."}
– R.Park
Great! I’ll post the answer to help other people who have the same problem. As for the new problem, by forum rules, you should open a new question to this question, as it is a different problem from the original question. Hug!
– Pedro Paulo
Okay @Pedropaulo thanks.
– R.Park