[kh99]

Well, for instance if you wanted to add an additional drop down menu under the "Forum" tab, you could go to the Navigation Manager (under Settings on the right in the adminCP), and in the drop down to the right of "Forum", select "Add Menu". After saving that, the manager will expand the other things under "Forum" (or you can expand it yourself any time by clicking on the name "Forum"), and you can proceed to add choices to your new menu by choosing "Add Link" in the drop down to the right of your new menu.

What I was saying above is that if you just go to the Navigation Manager and click on the "Forum" link you'll see the menus and links that are defined by default.