We are sorry the email you used to sign up is registered as your username which can't be changed.
You can change your contact email address on the account page on www.play.trueroyalty.tv. All messages like the newsletter and password reset emails are then send to your new contact email address. You will still need to use the initial email address for login.
If you are not sure how your login email address is written you can reach out to our support at firstname.lastname@example.org and we will help you out.