Hi.

We do not store your payment information. When you are in the checkout process, the page that accepts your payment option, the page you see after the Proceed to Checkout button. at the top you will see your information listed there if it has been entered previously, Click Edit the bottom left of that information area and change the information that needs updating. As a note, it is best to just clear out the address, city and state and enter the zip code you are now using first. That will enter the city/state for you.

Hope this helps!