Old user: unable to login

I'm an old user, never saw the email option before, I would like to mine again (got 10 miners) please help with reset of password or enable the account. (user gadotkach)

The email option is one you set to allow password recovery.
If you have never set it before then there is no way to recover your account.

If you no longer have access, you can wait a few week and hopefully with the new rollouts registrations will be re-opened and you can get a new account then.