Updating billing information
In the BILLING INFORMATION tab, you'll find the current method of payment along with the current billing address for your customer. You may need to edit the address in this section if the customer's address has changed or if you need to update the email address on file. This guide provides instructions on locating and updating the customer billing information.
Click on "UPDATE CARD"
This will bring you to the Card on File page.
Enter Credit Card information and edit Billing address by clicking "edit address" if need be.
Save by clicking the blue button to "Update Card".