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Press the Home button on your remote control. Select APPS. Select Settings or Options. Select the app you want to delete. Select Delete. Select Delete (newer models) or OK (older models).
This opens your smart TV's home screen. It's the icon at the bottom of the screen that contains 4 circles. Use the directional buttons on your remote control to navigate there (it should be near the bottom-left). The option you see varies depending on your model of smart TV. If you're using the 2016 model, select Delete now. Several options will appear below the app's icon. If you're using the 2016 model, select Done now. A confirmation message will appear. This removes the app from your TV.