MacBook Pro audio setup - Cubase Elements 10

Hi all
I’m new to this and just got Cubase Elements 10 on my MacBook Pro. I’m using Presonus Audiobox USB for input, and would very much like to use internal sound card for output, using headphones. My problem is, that when the Audiobox is connected, I can’t find internal sound card, until I disconnect the audiobox. They won’t show at the same time. Anyone out there who knows what to do???

„Aggregated device“

Please tell us more about how to set up “Aggregated device”.

Im a windows user - try Google!