My memory's a bit rusty, but I think right-clicking does most of the magic. Right click within a category, and a contextual menu should appear that includes an option to add a launcher. I can't remember if you can rename menu categories by right-clicking on them, but I think there should be some sort of 'properties' dialog that you can access. Hope that helps. You can also check the Gnome documentation, which I'm sure would answer your questions.

When you right click, it does nothing! I've tried that multiple times, but thank you for your input!

Select the following menu:
System > Preferences > Main Menu

This will open an application to control your main menu.

You can:

• re-order items (drag things around or use up/down buttons).
• hide items (un-check the display check-box)
• change display name, icon, and comments of existing entries (Right-click>Properties or Double-click)
• add a new separator, item, or menu (buttons on the right)

If you mess-up you can revert both for individual item and the whole menu (note: I have never tried this; also, I do not know what it reverts to---last state or factory default).

I never knew that the Main Menu application had that capability! Thank you very much.