Registration in the community is always done via confirmation email, in which you have to click on the activation link. Please check your SPAM folder of your email inbox. Due to SPAM filters and mail redirections it can happen now and again that an email is marked as spam. Errors can occur in some email programs as they cannot forward you via this link. I this is the case or if the activation mail is not in your SPAM folder, please contact us.
When in doubt check if you can already log into the community as the activation might have already been successful. The activation link only works once. If the activation has already been successful, the link automatically becomes invalid and you can log in with your email address and your password.