He'll need to send one of the
administrators a private message to get assistance with account/password recovery. If he has his own forum account, he'll need to post at least one comment somewhere on the forum for the private messaging feature to become enabled.
UPDATE: The new
password reset feature is now live. If you're still getting errors during login, try resetting the password using the e-mail address you registered your account with. Make sure it's less than 16 characters in length.