obsmac

Hello I have a Allen and heath QU-32 connected to my focusrite converter connected to my Mac and I can hear the main mic and ear piece mic for the pastor but I can't hear the piano, piano mic and the singers which is 3-4 mics being used. My obs isnt picking it up so we can't Livestream out song...

I have no game capture and i went to window capture and my game (ShellShock Live) will not show up let alone any other games i also don't know how to setup discord to it and when i go to desktop audio it says disabled i'm using macos high sierra does anyone have any solutions?