There are two types of "administrators" in GForum - there are user-side administrators, who have the ability to do anything moderators can do for every forum, plus a few extra abilities (such as globalling disabling a user), and admin-side users, who have complete and unrestricted access to the admin panel, which allows various low-level operations, such as changing database parameters, accessing the system via fileman, etc. If the site administrator intended to give you full access to the admin panel, they'll need to add a user in the Setup -> Admin Password menu.
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com