MyBB Community Forums

I want to my site a theme changer...and in order to that I need to modify the themes menu.
The problem is that i'm not html expert.....so This is my question.
Right now I've got the "Acord Dusk" Theme..and I want to add to some of the menus some submenus

Quote:<div class="menu">
<ul>
<li><a href="{$mybb->settings['bburl']}/portal.php"><title="Home" />Portal</a></li>
<li><a href="{$mybb->settings['bburl']}/Forum-News-Section"><alt="" title="Headlines" />News</a></li>
<li><a href="{$mybb->settings['bburl']}/index.php"><alt="" title="Community" />Forums</a></li>
<li><a href="{$mybb->settings['bburl']}/forum-72.html"><alt="" title="How-to's" />Tutorials</a></li>
<li><a href="{$mybb->settings['bburl']}/forum-9.html"><alt="" title="Assistance" />Malware Help</a></li>
<ul style="text-align:left;">
<li><a href="{$mybb->settings['bburl']}/forum-10.html">Removal Assistance</a>
<li><a href="{$mybb->settings['bburl']}/forum-11.html">Self-Removal Guides</a>
<li><a href="{$mybb->settings['bburl']}/forum-12.html">Security Wizard</a>
</ul>
<li><a href="{$mybb->settings['bburl']}/forum-9.html"><alt="" title="Test" />Test</a></li>
</ul>
</div>

This is how it now looks :

So in red is what I want to add as a submenu to this tab <li><a href="{$mybb->settings['bburl']}/forum-9.html"><alt="" title="Assistance" />Malware Help</a></li>

So what code to I need to use? Sorry for the noob question