Recording problem DJM 750

Guys I have a problem. I'm plugged a DJM-750 mixer to my MacBook Air 2017 cause I need record a few second audio of my voice, I downloaded the driver utility I change setting to rec out on 1/2 channel, now I try to open a audacity program and I can't find my mixer in record input I try open garageband and the problem is the same I can only use internal microphone, I don't know what im doing wrong. In system preferences I can find that the djm 750 is connected to my MacBook  pls Help cause I try to do it almost 2 days