If you haven't logged in since closed beta and you made purchases during closed beta, please click here and let us know your Closed Beta display name and what purchases you made so we can transfer those over. In the meantime, go ahead and Register a new account so you can start playing.
If you played during closed beta but did not make any purchases during closed beta, we don't need to transfer anything over. You just need to register a new account. Do let us know if there's anything else with which we can help.