What do I do if my billing address is different from shipping?

When you are on the payment page, make sure to click on "Uncheck this box if your billing address is different from shipping address". It will prompt the fields for the address to drop down, just change it to your correct billing address.

Alternatively, you can log in to your account, click on My Account, Address Book and add a new address marking it as your default billing address.

Please, mind that only logged in users can submit questions