How do I add objects in to a level using JK2 Radiant?

By objects I mean items you can pick up. (Weapons, power ups, ect...), as well as stationary objects like shuttles, parked AT-ST's, and so on.

I've been tinkering with this program for a while, but this stuff has eluded me so far . Thanks for any assistance.

Well, just right click anywhere on the main window (the big grid). It should give you a list of stuff you can put in the map, from NPCs to weapons to various entites.

Also, I would suggest dropping JK2radiant and use GtKradiant.

Check out these tutorials:

http://www.richdiesal.map-craft.com/tutorials/index.html