How are you trying to add the contacts? It's not clear if Address Book is not working correctly, or if you are unsure how to use it. If it's the latter, open Address Book, select help and there is lots of good stuff in there.
A MacPro 2.66 Xeon, an iMac G5, a Uni MB, a wee PowerBook 12" 1.5, an eMac, a couple of cameras, a lens collection and a wonderful iPod. Oh, and a delicious wife
"Words are sacred. They deserve respect. If you get the right ones in the right order, you can nudge the world a little." Tom Stoppard
“No tears in the writer, no tears in the reader".