Download and install the Calibre program. Compatible downloads include Windows, OS X, Linux and portable devices.
Open the Calibre program. Click the "Add book" icon link in the menu to add a DRM-free book to your Calibre library.
Select the book in the Calibre library list, and click the "Convert Books" icon link in the menu.
From the "Output format" drop-down menu, select the conversion choice. Drop-down menu is located in the upper right of the conversion window. Click "OK."
Plug the e-reader device into the computer. Click the "Transfer to device" icon link in the menu to transfer automatically.
Download, install and open Kindle Previewer for Mac or PC.
Drag the EPUB file over the open Previewer window.
Click the popup window link "The output file has been generated here."
Plug in and open the Kindle on the computer. Drag and drop the MOBI file into the documents folder located on the Kindle device.