How do I make a drop down menu?

<ul id="MenuBar2" class="MenuBarHorizontal">
    <li><a class="MenuBarItemSubmenu" href="#">Item 1</a>
         <ul>
              <li><a href="#">Mr</a></li>
              <li><a href="#">Mrs</a></li>
              <li><a href="#">Miss</a></li>
              <li><a href="#">Ms</a></li>
              <li><a href="#">Master</a></li>
              <li><a href="#">Prof.</a></li>
              <li><a href="#">Dr</a></li>
         </ul>
    </li>
</ul>

This is the code that I have used on Dreamweaver Cs6. The drop down works however, when I click on one of the titles, it doesn't select it. Could someone explain how to fix this problem please.

Thanks :)