Voilà la réponse gros noob, c'était sur le site dans la FAQ:
5. Q: I purchased a Founder Pack, how do I get into the game?
Answer: An email with instructions on how to install the game should be sent to you automatically, specified during registration. If for some reason the letter did not reach you, login to your account on the site and go to the Beta Test Lottery page to get all the necessary information.
Bon voilà ça servira ptet à d'autres.