This means, in this window, you have to define which audio signal (microphone, internal player, jack 3.5 input, ...) you want to see in our software.

There are a bunch of tutos telling how to configure audio in and out.
https://www.top-password.com/blog/open- ... indows-10/
https://youtu.be/i5LbYVpX7Hk?t=141