First of all you have to make sure that you completed the
registration. If you did not get the confirmation screen then
registration did not take place and you will not get an account
activation email. Please go back and register again.

If you are sure that you completed you registration then you may
want to wait a bit longer for the email. Sometimes it takes quite a
while (several hours) for an email to reach its destination.

If you still don't receive the activation email by next day then
most likely you did not type in a proper email address or your mailbox
was full, message was in your spam mail, etc.

Contact the web master ask for help. Tell them the exact user name
and email address you have user. Don't send them your password.