They have both an application and email verification enabled there.

If you have gotten the email verification and clicked the link, then an admin there needs to approve you (you should get an approval email when they do).

If you haven't gotten the initial email to verify your address, then it either failed to send on their end or it's in your spam folder.

The admins there will not even see your registration application until your email is verified. You also won't be able to log in until they approve the account.