BlogsMu Theme - Navigation Bar Manipulation

Using WordPress 3.0, BP 1.2.5

Quick question, I'd like to modify the nav bar on top. The original listing is "Home, Activity, Members, Group, Forums, Blogs." I am creating my own html pages to show available blogs and groups and therefore I want to eliminate the "Group" and "Blogs" links. How do I do this? I might also be interested in manipulating the order of some of these links. Unfortunately, I'm too much of a "noob" to know what file to access to modify the list.

Thanks in advance for any help!