This article applies to your 123-reg account.
To update the contact details on your invoices:
Scroll down to the Account Management section.
Click on the Update Personal Information button.
To change your Account Information, click on the Edit Details button.
Check that the information entered is correct and then click on the Update button.
Your contact details will now be updated.
Return to the control panel and select View all account activity to access your list of invoices.
Click on an invoice number to view your invoice with your updated address.