Board Commander purchases are handled by payment service Zaxaa.
When you log in to Zaxaa, you can view your subscription details, and you can also change the credit card which gets billed.
Here is how to do it:
1) Go to Zaxaa.com, and login with your email and password (or click reset password on zaxaa.com) and then click “my purchases” at the top and then access product.
Here is the screenshot:
After you click "My purchases", you will be taken to this page (image below). From here, you can either View your subscription details, or you can click on the Credit card image and update your credit card: