How do I move ibooks to my Kindle Fire?

Apple20141 wrote:

only if you bought books in the Amazon Kindle App

Free .epub format books without DRM obtained in the ibookstore can also be read on a Kindle Fire with appropriate software.

Paid for books from the ibookstore normally cannot be read on a Kindle, so it may not make sense to do what you are suggesting.

A Kindle fire runs Android and a iBooks is for Apple Devices

only if you bought books in the Amazon Kindle App for iPhone,iPad,iPod Touch then they will be synced