First log into your Store Account:
Click on your username in the top right corner of the page and then select ‘My Orders’.
You will see a list of your orders. Click the ‘Manage’ button for the order, which you would like to modify.
Next, click on ‘Change Payment Method’.
Then select the new payment method, update the details and submit.
If you have any trouble updating your payment details, feel free to contact customer support via the ‘Submit a Request’ button below.