Hi pakkralj,
Do you want to bring a couple channels in to the mixer over USB?
The default patch setting routes USB inputs 1&2 to the Return 1&2 channels.
Go to Patching, Input-A, scroll down and you will see this.
You will need to make sure your computer is sending those two channels over USB to the mixer.
For the mixer outputs, back to the DAW, go to the Patch page, USB, and select as sources
a couple channels, or the Main L/R mix, or a couple Auxes, whatever you want.
Make sure your DAW input patching sees the mixer's USB outputs.
Thanks and good health, Weogo