How to interface UR12's microphone to computer monitor stereo?

I have a UR12, it connect to my desktop computer thru USB2.0 cable.

My computer connected to a TV monitor thru HDMI interface.

i can hear computer’s voice and microphone’s sound by select playback device.

But i cannot hear microphone’s sound from my TV monitor. The wierd thing is that in my Karaoke software, i can see that UR12 is in the list (Another one is from Relteck). However when i select UR12, software remind me it cannot detect the microphone.

I installed driver and updated firmware upto the latest.

anyone can help on this?