Connect the video output on your cable box to the video input on the TV tuner box using the S-video cable.
Connect the audio outputs on your cable box to the audio input on the TV tuner box using audio cables.
Connect the VGA output on the TV tuner box to the VGA jack on your PC monitor with the VGA monitor cable.
If your monitor has built-in speakers, connect the external TV tuner box's audio output to the PC monitor's audio input. If your monitor does not have speakers, connect the tuner box's audio output to external media speakers.
Turn on the cable box and monitor. Use the external TV tuner box remote control and click the "Mode" button until you can select the source for the television. Use the remote control for the cable box to switch through channels.