I downloaded it, and I have no problem getting books from Amazon onto it. But I can't figure out how to get books from places like Gutenberg. I got the Send to Kindle for PC, and I downloaded the files from the website to my documents; but when I try to use the Send-to-Kindle to send the files to my Kindle App, it says that I have to register a Kindle. It won't let me send the files unless I "register a Kindle". But as far as I can tell, my Kindle reading app for Windows 8 is already registered. Why won't it work?
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Kindle reading app for Windows 8?