Untitled

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("#show_more").click(function(){
    $("#show_here").append(" <b>Appended text</b>.");
  });

});
</script>
</head>
<body>
<div id="show_here"></div>

<button id="show_more">Append text</button>

</body>
</html>