You need to do some things before you can use the Amazon Alexa Site
Thumbnail service:

1) Visit http://aws.amazon.com/ to create an Amazon AWS account.

2) Obtain your AWS public key and secret key to use with the thumbnail
   service.

3) Visit http://aws.amazon.com/ast/ for more information and
   resources.

   DISCLAIMER: No one but you is responsible for paying Amazon to
	       use the Thumbnail service. The service does not have
	       a free sandbox area, so be aware how much money you
	       are spending to use the service.