Looking at the manual for your unit, your source selections are:
SELECTING THE MUSIC SOURCE
Press the source button to cycle through the following
sources
(if available) Radio> CD> FRT USB> REAR USB>
SD> BT AUDIO> AUX1> AUX2
You would need to connect the audio output from your TV to either the front or rear AUX inputs of your stereo unit. Either via a 3mm stereo audio connector from the headphone jack of the TV if it has one, or via the audio RCA outputs of the TV, to a 3mm stereo audio connector that plugs into the AUX socket on the front of the stereo, or RCA connectors to the rear AUX input of the stereo unit.
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Yes I am an agent of Satan, but my duties are largely ceremonial.