Best answer by ProTruckDriver
To update your Auto-pay (Credit Card number / expiry date) on your account, Please submit a Support Ticket or Contact Webroot Support . This service is FREE with a Paid Subscription.
Support Ticket System is Open 24/7
Note: When submitting a Support Ticket, Please wait for a response from Support. Putting in another Support Ticket on this problem before Support responses will put your first Support Ticket at the end of the queue.