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This is the setting that matters most. Get it right and most things look after themselves. Go to the setup tab, under audio input.
1

Choose your audio interface

Pick it from the list. This is the box your microphones are plugged into.
2

Choose the channel the lead singer is on

If your desk sends lots of channels, you will see them all. Pick the one the lead vocal comes in on.
3

Check it

Under check, press check the microphone. Sing or say a line.It shows you we heard: and the words. That is how you know you picked the right channel.If it says we didn’t hear anything — try another channel, pick a different one and check again.
It must be the vocal channel, not the main mix. A main mix has the whole band in it, and the singing gets lost underneath. This is the single most common thing to get wrong.

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More than one singer

If you have two or three people leading together, add each of their microphones. ScreenShepherd follows whoever is singing. You can add up to three.

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If it stops hearing anything later

Come back to setup and pick the interface again. If you unplug the interface, or move it to a different socket, the Mac can number things differently and the saved choice no longer points at the right input. ScreenShepherd tells you when this has happened — it shows not found — choose one instead of quietly listening to the wrong thing. Stopping and starting will not fix this. Re-picking the interface will.

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Troubleshooting

Try each channel in turn — it is nearly always the wrong channel rather than a broken input. Make sure someone is actually singing into that microphone while you check.
That is fine. It does not need every word.
You are probably on a main mix rather than the vocal channel. Or your second leader’s microphone has not been added.
You cannot check while it is listening. Press stop first.