Sign up with them (try and sign up first, then login and go to the warhammer key site, because when i just entered my birthday and language and tried to sign up, it bugged out and did nothing) then do the little birthday and language thing and request a key. If it says something about there being no keys in the "pool" go back (in your browser) and change the language from say English to German and try again. Keep trying and you will get a key, i got 2 (limited 1 to 1 account) for both for my friends since i already had a close beta invite.