Download Mango Display App from the Amazon App Store on your display device (Amazon Fire TV Edition, Amazon Fire TV stick, Amazon Fire Tablet).
Open the Mango Display App, it will provide you with a 'Display Device Code'
Visit app.mangodisplay.com on any browser (phone, tablet or computer). Register and log in.
Once logged in. Click on 'Add New Display'
In the next screen, select the Amazon Fire App
In the next screen, name your Mango Display (Living Room, Kitchen Fire Tablet, etc.) and click 'Next'
Enter the 'Display Device Code' that is displayed on your Mango Display App (Refer to step #2 above). Click Finish.
Done! 🎉 Your Fire display is now connected and the layout can be configured as needed.