You can change your billing information for your subscriptions at any time through “My Account” on ZENB.com once you have created an account.
Simply sign in to your account at https://zenb.com/account/login. Once you have logged in, click on the "Manage Subscriptions" link underneath the Account Details. You can update your billing and shipping addresses within "Address and shipping information," and your credit card info within "Payment information."
You must make any changes to your billing info 24 hours before your "Next Order Day" for each period in order to ensure the changes are in place for that order.
If you have multiple recurring orders in place that you wish to adjust you will need to go through the process outlined above for each individual order to ensure that the billing info for all of your recurring orders has been successfully altered.