If you would like to update the email address(es) associated with an account registration, follow the below steps.
If you would also like to update the email on your Payreq account (i.e. the email you use to login to Payreq please refer to How do I update my account login email?
Updating account registration emails:
1. Login to you Payreq MyBills account https://go.payreq.com
2. Click 'Subscriptions' in the top menu and select the biller
3. Click the subscription
4. Click Add/Remove Emails
5. Update your emails and click 'Save'