The conversion from EPUB to MOBI/KF8 format can be accomplished using the Kindle Previewer. Kindle previewer 3 can be downloaded from
The EPUB file can be input to the previewer where it is converted and displayed. The displayed MOBI file is not saved automatically, but can be saved using the Export option in the File menu.
I used to recommend the Kindlegen program for converting epub files to mobi files, but this program is no longer supplied or supported by Amazon.
To side-load the Mobi file on a Kindle connect the Kindle to your PC using the provided USB cable. The Kindle will appear as a drive on your PC. Under this drive there are several directories, one of which is named “documents”. You want to copy the MOBI file you created to this directory on the Kindle. You can then safely disconnect the Kindle as you would any connected device. When Windows says it is safe to disconnect the device, you can remove the cable from both the Kindle and the PC. The book you created will now appear on the home page of your Kindle.
If you are selling your book on Amazon, the epub file can be used for uploading your document. You should consult the Amazon Kindle Publishing Guidlines for Amazon's requirements.