Most people download from this site and others by using their pc, and copying to the pc via USB. A couple of the sites have a mobile "guide" with links to the books. You can place the guide on your Kindle, turn on Whispernet, and download directly from the guide.
Some people have had difficulty connecting K2s via USB, I know. Usually, using a different USB port on the pc has helped. Check out some of the threads about this on the forum.
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