Log into the Dev Center (Apple site where you downloaded the SDK), and then look where the login button used before you logged in.
thanks mate, but there is no Portal there, just my name and logout.
I have a bad feeling something went wrong with my activation, but then why did I receive confirmation email that I'm registered iPhone developer?
Edit: also there is this text: "Already applied to the Program? We are currently processing your enrollment application and will be contacting you soon."