cant log in

I downloaded wow and when it says to log in I enter this username and my password and it wont let me log in, anyone know the problem?
Metzu wrote:Make sure the realm you're loggin' into is the normal realm, Nostalrius Begins and not the test realms. The test realms will give you a disconnect everytime you try to log in, so when you log in, hit "Esc" button fast afterwards you get the "Success" message and you'll be able to choose the normal realm again.