When you get to the login screen, go to "account". Once you log into station account, there will be an option to register the expansion. Just enter the key code that came with your PoR box.
Mmm I tried to activate account key and got the message: Sorry - The consumption of this account key requires features which your subscription does not have.
I own all 10 previous expations so I am at a loss as to what this means... any help on this one would be greatly apriciated.