Page marking

Question

I am trying to create a bookmarking field book page, but I am not able to relate tables. I created 3 tables User, Title and Pages. I even managed to relate to the user with cookie, but I’m not able to think of a way to relate the title id.

<?php
$login_cookie = $_COOKIE['login'];
    if (!isset($login_cookie)) {
      header("Location: index.php");
    }

$con = mysqli_connect('localhost', 'root', '', 'lista');
$paginas = $_POST["paginas"];
$ins = "INSERT INTO paginas (paginas, usuario) VALUES ('".$paginas."','".$login_cookie."')";


if(mysqli_query($con, $ins)) {

echo "Registrado com sucesso!";

} else {
    echo "Erro ao registrar!";
}

mysqli_close($con);
?>
 ?>