Question Help. I need to setup karaoke

Jan 7, 2020
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Hi. Im Vy Ho and this is the first time i post up here. I bought a lots of things to setup karaoke but i got something wrong and i counld find the reason. I had smart TV LG 43LM5700PUA, Sony multi channel AV receiver, speakers and the wireless microphone FiFine Tech M-K036.
The problem is when i play youtube or any app in TV, micro doesn’t work. I couldn’t know how to do that even i had changed a lots of thing or tried all the way i could, but useless.
pls help me if you know what happens. I appeciate

Thanks
 

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