1. Make sure you're logged into your account and on your seller dashboard (https://amzrc.com/start1)
2. If you paid with paypal, you can update your payment method in your Paypal account.
3. If you paid with a credit card, click on the "Update Billing" tab in your seller dashboard.
A). Click on the type of credit card
B). Fill in your Credit Card Info, and Your Billing Address
C). Click on "Submit Form" to save your billing information