In step 2 of the first time setup process, you select the audio gear you want to use with JamKazam, and then let JamKazam run a test on your gear to make sure its performance is good enough to support online music sessions.
If you are using the built-in microphone and headphone jack on your Mac, following is a video that shows how to use select and test your interface in step 2 of the first time setup process:
Select and Test Audio Gear - Mac Built-In
If you are using an external audio interface connected to your Mac, following is a video that shows how to use select and test your interface in step 2 of the first time setup process:
Select and Test Audio Gear - Mac with External Interface
Configuration on the Mac is incredibly simple compared to Windows. Basically there is nothing for you to configure. It just works.
One troublesome issue we've noticed though on Macs is that audio processing is getting quite a bit worse on the newer/latest Macs being built. We don't know why this is, but it definitely is, and we now see the newest Macs failing the JamKazam latency test when using the built-in audio system. If you are using the built-in audio system on your Mac, and if your Mac is failing the latency test, we'd advise that you actually plug a set of headphones into the headphone jack, and then click the Resync button on step 2. On the newer Macs, having headphones plugged in reduces the latency considerably, and will often result in your Mac passing the latency test vs. failing it.
If you are struggling and can't get this step to work, please using the "Post a Public Question" in the right column of this page to submit a support request, and we'll be happy to see if we can help you get things working properly.