Do you know what version of OSX you are running? You need at least 10.7 to be able to use the iCloud feature with OSX on your computer
OK -- I've got 10.6.8. Can I download 10.7?
Yes you can, You should have the APP Store on your system. You can purchase the newest 10.8 though there for $20
Please reference this website to look up software you are using on the OS to make sure its compatabile
All right -- I'll do that, and then I'll try again with the find-my iphone thing. Thanks! GB