There are 2 ways to update your payment information:

1. Go to your account page and click on "Edit" next to your payment method. Once you have updated the payment method, return to your account page and check if the information is correct.
2. You can edit your billing information when you ship your box. Simply click "Edit" on the Payment method during the order confirmation step.

Note that any of the updates above will update your default payment method on file, and that card will be charged for your subscription going forward unless you update it.