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How can I add another tag <li> ... </li> after the last with Jquery? 
I have installed a plugin "Jquery Custom", and would do it there.
<div class="col-sm-5 col-md-5 social-media style-1">
   <h3 class="widget-title">Permaneça conectado</h3>
   <ul class="social-link">
      <li class="icon-facebook">
         <a target="_blank" href="https://www.facebook.com/">
            <i class="fa fa-facebook"></i>
         </a>
      </li>
      <li class="icon-instagram">
         <a target="_blank" href="https://www.instagram.com/">
            <i class="fa fa-instagram"></i>
         </a>
      </li>
      <li class="icon-google-plus">
         <a target="_blank" href="https://plus.google.com/communities/114812437665613081264">
            <i class="fa fa-flickr"></i>
         </a>
      </li>
  </ul>
</div>
						
I solved the situation with your help, gratitude.
– ElvisP