You can contact account support or fill in a form in Portal.
How to complete the form
1. Head to your account and select 'Support' in the toolbar in the top right-hand corner.
2. Use the drop-down menu and select 'My Account Details' and 'I would like to change my invoice address'.
3. Use the drop-down menu and select 'My Account Details' and 'I would like to change my invoice address'.
4. Follow the instructions and type in your new invoice address. Then press submit.