How do I get to the Canadian iTunes Store?

I bought a iTunes card and when I enter the code to redeem the card it says: “Your iTunes Store (US) does not match that of the gift certificate (Canadian)”. I downloaded the new version of iTunes (9), and now I’m worried I downloaded the American one or something. Can someone help me find a way to get on the CANADIAN iTunes Store so I can finally buy some music!? I have had so much trouble with getting the code, and now I can’t even redeem it, argghhhh..