Email to Gamesrocket
Please create a Battle.net account here or sign in to you existing account.
Enter your personal data and create your own account.
Go to your email inbox and click the confirmation link in the email from Battle.net.
Your Battle.net account is now confirmed. Please go to account management. Click "Add game" on the left.
Enter your activation code which you have received from Gamesrocket via email. Then click "Activate game". Your game is now activated and you can start the download.