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 informationIf 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:
Do not use dashes or spaces when typing your credit card number.
Do not use periods or any other punctuation when typing your name. Type your name exactly as it appears on your card.
Do not leave any fields blank; all fields are required.
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.