How to use navigation bar at BP Daily


here I'm again. Not sure with this question, but I already saw your video, still did not get how to manage the navigation bar.

I got three navigation bar:

1. At the very top are the categories
2. In the middle seems to be the new Menu from WP 3.0
3. Than the last one is the navigation from the Buddypress

My website is:

My questions are:

1. how can I put page into the navigation bar? I want to put it in the third one, after the whole buddypress button.
2. In the middle navigation, how can I have sub-page? It seems it can not show it

Thanks a lot for the help,