2.2) I don't remember my password and the email address registered with my account is not valid anymore.

In this case, you can try to send us an email to info@brainking.com and describe as many information about your account as possible. If we decide that the mentioned account really belongs to you (which is never guaranteed and, honestly, there is a low chance at all, due to security reasons), you will be sent a new password. Otherwise, the only option is to open a new BrainKing account.