If you entered your email address incorrectly, please contact your Event Organiser directly to ask them to amend it.
In most cases, your Event Organiser will be able to fix the email address (for instance, if your email address is incorrect). If you need to add an entirely new email address, please use the new one on your next booking and then contact your Event Organiser to see if your accounts can be merged.
This cannot be completed in some cases (due to GDPR). In such cases, they will be advised to contact the Bookwhen support team.