1. Aim the Skyworth TV remote control at the TV and press the "Menu key", and the common menu settings will pop up at the bottom of the TV. 2. Use the left and right arrow keys of the TV remote control to select the TV's "Channel Selection" setting, and then press the "Menu" key to confirm. 3. After entering the channel selection interface, press the up and down arrow keys of the remote controller, select "Video 1" and press the "Menu" key to confirm. 4. Transmit the TV picture to the playing picture of the digital TV set-top box. If the signal output by the set-top box is connected to the AV 1 port of Skyworth TV. 5. You need to switch the signal source to video 1 to bring up the playing picture of digital TV.