Edit in JSFiddle

$(document).ready(function() {
  $("button").click(function() {
    $("p").append(" Thanks for clicking!");
    $("p").after(" Thanks for clicking!");
  });
});
<h2>jCombat Demo - jQuery DOM Manipulations</h2>

<div id="content">
  <p>This is a paragraph. <a href="#">Sample Link</a></p>
</div>

<button>Click here</button>