If for whatever reason you need to switch this TV over to backup content it can be done the following way. Before attempting, if you typically have Apple TV content on this screen ensure the Apple TV is powered on.
TV Input: HDMI 1 - Apple TV (or Merchandise Wall Media Player)
TV Input: HDMI 2 - Merchandise Wall Media Player (or ZeeVee Tuner Box)
1. Use the Samsung TV remote to change the Input of the TV to HDMI 2. This will show either the Media Player advertising loop, or the ZeeVee Tuner box.
2. The channel can be changed on the ZeeVee Tuner Box using the ZV Remote seen below. Channels available are 61.1, 62.1, 81.1, 82.1, 83.1, and 84.1.