TV Steps for finding Serial Number/License Key of Media player How to find out the Serial Number/License Key for a screen or media player using the included remote: Press the square ‘stop’ button on the remote to halt content playback Press the ‘setup’ button to launch the menu Enter the ‘System Control’ menu Navigate to ‘Machine Number’ and record the number shown Select the ‘back’ button at the top of the menu Select the red ‘exit’ button at the bottom left of the menu Press the ‘play’ button to resume playback