Choose the Mobi/PRC books and sideload via the USB cord provided with the Kindle. Just plug it in and drag the book file to the "documents" folder on your K3, "safe eject" or "unmount" it depending on what OS you're running, and you should be good to go.
If the book you want isn't available in Mobi/PRC, but can be had in another format, you can always use Calibre to convert it to something the Kindle can read.
Hope this helps and welcome to MobileRead!
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