Here's how:
1. Log into Cambridge One
2. Click on 'Your name' (top right of your screen), then click 'My profile'
3. On the next page, you can edit your details, including your name, email address, and country
4. Click ‘Save’.
Note that if you change your email address, you will be emailed a verification link to confirm this before you can log in. If you don't receive a link, read I have signed up but I haven’t received a verification email.