If you're on the desktop browser:
You can update your ShopBack account personal information here - (for desktop version only).
If you're on the ShopBack app:
Click on the "Account" (Refer screenshot below), then tap on 'Personal Information'.
You can update your Full Name, Birthday, Phone number, Address and Postal Code.
However, you will not be able to change the ShopBack account email address from your end. But, don't panic!