JSFiddle - React, Tailwind, and code Playground

HTML

<li class="submit-listing"><a href="http://localhost/proficientlink/post-your-ad/"><i class="fa fa-plus"></i> Submit Listing</a></li>

JavaScript

$('.submit-listing a').html(function (i, el) {
  return el.replace('Submit Listing', 'Post your ad');
});