Connecting iMac to Qu 32

Hi. I have just bought a imac 21.5inch apple computer to use with my qu 32 mixer. I am trying to get it connected to the mixer so that I can play music & videos through the mixer to our projector and speakers. I have never worked with an apple so I need very simple instruction on how to set up the imac and the qu 32 so that it will work. I have a usb cable at the imac connected to a usb b at the qu 32 input, is this correct? What settings do I need on each side. Please someone help.

read the Qu manual for details

go to setup at bottom button by screen on right
then look for usb on screen and push
then at that screen make your assignments

sorry but I have no idea what the mac needs to make usb work

as to video you need to feed the projector directly from the mac not the Qu
again that is a mac question for them to answer

you can also send sound from the Qu to wherever you want it heard on speakers for both simultaneously on screen and speakers