[Mediawiki-l] Cannot remove items from navigation bar

[Beans Interactive Media]

Hello

I looked everywhere on the server and in the admin mode, 
but i cannot find anywhere how to remove or add items from
the navigation menu. I read the Help files and it points me to the SideBar
file but i cannot find it.

Can anybody tell me step by step how to do it? It will probably help me
to understand the way the help file is to be used as well!

Thanks,

Bart
(Media Wiki Noob level!)