First, check your username and password. If they are correct, then one of two things may have happened. If COPPA support is enabled and you specified being under 13 years old during registration, you will have to follow the instructions you received. Some boards will also require new registrations to be activated, either by yourself or by an administrator before you can logon; this information was present during registration. If you were sent an email, follow the instructions. If you did not receive an email, you may have provided an incorrect email address or the email may have been picked up by a spam filer. If you are sure the email address you provided is correct, try contacting an administrator.