1. Login to your account using a desktop or laptop
2. Go to Account & More, at the bottom of the blue bar on the left
3. Click into My Account
3. Under your Profile tab, you'll see your current email address - type over the current details to change your email address
4. Scroll down and click Update
5. It should say "Changes saved"
You will need to logout of the app, and back in again with the new email address to see the changes reflected on your app.
If you need additional help with this process, please contact email@example.com.