Changing your email on Challengermode is easy, simply navigate to my account by clicking on your profile, then go to settings.
When you´re on the "my account" page edit the current email, type in your password and click save.
You should now get a verification link sent to your newly assigned email address, press the link and you´re good to go!
Running into other issues, or do you have additional questions? Feel free to chat with us by clicking (?) on Challengermode.