We add list items to a nested list the same way we add them to other lists.

Add these list items to the nested list.

<html>
 <body>
  <ul>
   <li>Best Comic Book Movies:
    <ol>
     <li>The Dark Knight</li> 
     <li>Spider-Man 2</li>
    </ol>
   </li>
  </ul>
 </body>
</html>]]>

Make sure to place list item text between the <li> and </li> tags.