If you cannot check-out your shopping cart please make sure the billing address for your credit card matches the address you entered when you first registered. If the billing addresses don't match, our website won't be able to process your credit card and you will receive an error message. You can edit the billing and shipping addresses on-line by clicking on "My Account" on the top of our website's home page. If this problem continues please call Customer Service at 800-441-8381.