Send an email to support (at) rebirthro (dot) com, or go to support.rebirthro.com and open a ticket with the following information:
If you have access to the original email
If you do not have access to the original email
All email change requests are done manually, and may take anywhere from a day to a few weeks to complete.
Once an email has been sent, please be patient. Do not go to the GM Help Desk and ask about the status of your request. The GM team and Support team are different, and the GMs will not be able to answer your question.