If you still have access to the account email you can recover it automatically. If you do not there is an email in the time of knowledge you can send a request to, or you can go to irc and get a staff member to help you there.
I tried irc. I was told my account was before they had account names and so I could not reset I am waiting for a response to my e mail now. I still have my receipts from donating years and years ago.