Below is a message I got from Amazon.  I can't see anywhere to update my credit card for Turnkey Linux.

Please advise ASAP!!!

Thanks,

Brian

Subject: Billing Alert from Amazon Payments

Greetings from Amazon Payments,

Amazon Payments is performing the billing for your purchased application(s). After several attempts, we have been unable to charge your credit card for $21.07 for Dec 1, 2014 to Dec 31, 2014. As a result, your access to the following application(s) below has been cancelled.

Application Details:

Application: TurnKey Backup and Migration Sold by: TurnKey Linux Contact information: http://www.turnkeylinux.org/help

To view information about the applications and details about this charge, go to the following web page:

http://www.amazon.com/dp-applications

If you have any questions regarding this payment, please contact us at application-payments@amazon.com. 

Sincerely,

Amazon Payments