Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
Connect the Kindle to your computer with a USB cable.
When you connect the Kindle to your Mac, it will appear as an external drive.
Open the drive icon, and locate the folder named “documents”. Among other files types, the folder contains files in .azw format.
You can convert this file to read on your Mac using converter software: