How to uninstall apps on Amazon Fire TV
You may need to uninstall an app on your Fire TV device. The following article will show you how.
Step 1: From the Home screen, long press the Home button on your remote 
then click Settings in the menu that appears.
then click Settings in the menu that appears.Step 2: In the Settings, select Applications.
Step 3: Select Manage Installed Applications
Step 4: Select the App to be uninstalled
Step 5: Select Uninstall
Step 6: A notification will popup asking for confirmation. Select Uninstall
