This is the information from our support website for changing you credit card information.
Use the Update Credit Card tool to update your credit card billing information If you bill your service to a credit card, you can update your credit card billing information with the Update Credit Card tool.
Keep these tips in mind when you update your credit card information:
Note: Billing tools are only accessible to primary account users. To use this tool, you must log in with a primary account user name and password.