1.) I have registered, but have not received the activation mail
Please check your email if the activation mail is in your spam folder. Especially with Microsoft services like Hotmail, Outlook or Live it's happening.
Further typing mistakes happen sometimes. In this case just register again and contact our support to remove the account with the wrong email address.
2.) When I want to login, it says that my account is not activated yet
Click on the link in the activation email in order to activate your account.
3.) I have activated my account, what now?
Login with your email address and your password.