Audio not coming from video source

So I’m using the manycam standard plan and I’ve connected only one source. But I’m actually monitoring and managing the whole transmition with my computer. The issue is that the only audio input ManyCam finds is my computers microphone and not the phone’s microphone. I just want to use the computer to cahnge between sources but I don’t want to use that microphone. Is there a way I can monitor the transmition on ManyCam computer and use my phone’s(the video source) microphone as audio input?