Account: I Want to Verify Which Credit Card the Bi-Yearly Amount Was Debited To

I need to find out the credit card that the amount was billed to, and if needed, how can it be changed. I can not find an area anywhere to change settings for payment.

The credit card charged was the one ending with ***3600. If you wan to change your credit card, you can click the Change Credit Card button in your Billing page.