To change your email on your HER profile follow these instructions depending on your device:
iOS: Go to My Profile > Settings > Account information > Email.
Then tap on your email and you can change as needed. Don't forget to tap on "Save" in the top, right hand corner before exiting the account settings view.
Android: Go to the "..." in the top right hand corner > Settings > Account information > Email.
Enter in your email and once you say "ok" it will be saved.