To update your payment information:
a) To edit the card you are currently using to pay for your service, click the "Edit" button, edit the card, and click "Continue."
b) To switch to a different card, click the "Add a new payment method" link in the upper-right corner, select or add a different card, and click "Continue."
Once you have updated the payment information for your service, we'll bill your card using the new information. To update payment information for additional services, return to the Service Summary page at https://billing.yahoo.com and repeat the steps above.
Note: If your account is past due, we'll try to authorize your credit card for the full amount of the past-due invoice. If your card is authorized, your account will become active within one hour, and you should no longer see the online alerts in your account. If you continue to see alerts after updating your billing information, please contact customer care.
Yahoo! Store owners (not Merchant Solutions)—view instructions for updating your billing information.