If you have not receieved your email after registering that has your authorization code, check your spam or trash folder. The email is generated in a way that some filters will interpret as spam.
If you have registered and are activated, but forgot your password, just hit the "I forgot my password" text link underneath the login page. It will send your info to the email you registered with.
If you still need help, or a manual activation, please email me at wayne AT caves DOT org and I'll be glad to help.