Make sure your phone, tablet, or computer and your Amazon Fire TV are connected to the same Wi-Fi network
On Fire TV, go to Settings
Select Display & Sounds
Select Enable Display Mirroring
On your device, open the cast, screen mirroring, or wireless display option
Select your Fire TV from the list of available devices
Follow any on-screen prompts to connect
To cast from supported apps, open the app and tap the Cast icon
Choose your Fire TV device from the list
Stop casting from the app or device when finished