Wtf happens if you forget your email exactly? To change your email, you need your email, to change your password you need your email, to recover your account you need your email? Wtf?
Email the above said email provided. They will then ask you certain questions in order to prove that you are the original owner. Once you answer that then you can manually recover it, and set details.
There is a section on the RS official forums for email help as well if you aren't able to access the email set on your account or if a hacker set one on there.