For security purposes, only you, as the primary account holder, can make changes to the billing information stored on your Sawyer account. When registering directly with a provider, you can authorize them to use the encrypted payment method stored on your Sawyer account or provide them with a new payment type at the time of booking.
Click on the Welcome tab at the top right. It will say Hi, [Name] once you have entered your personal information on the site.
Click on Account to view your current default billing information under Payment Method.
To change the default card on file, click Update next to Payment Method and add your new billing information.