You can change your registered mobile number but due to security reasons, changing of email will not be allowed at this moment. However, to make things easier for users, we will be introducing changing of your email-id too in future releases.
Changing mobile number
To edit your profile, navigate to My Account. Make the necessary changes (in this case your mobile number) and click Submit.
In the left menu of your Bitfeu app, click on the edit profile option (red arrow).
Under Edit Profile option, make the necessary changes (in this case your mobile number) and click Update.