how do it get my contacts into the cloud contacts for siri to recognize

I've looked through the Siri help stuff, and there' slots of things that tell me to put my info/contact into Siri at Settings / Siri / My Info. Great, but when I select that, I get an "All icloud" contact list. Since I have mself, wife, colleagues already in my contacts (MS Exchange) already -- how do I simply "copy" them into the icloud contact group???? I certainly don't want ot have to re-enter them twice. Also, I'm on a PC, is there no web interface from my PC to my icloud account? Any help greatly appreciated -- I'm obviously on the new 4S ...