Connecting headphones to audacity

I am having trouble connecting my headphones to audacity. I bought an Audiobox from Presonus, and the headphones came with that.
I am using a Mac Book Air 10.9.5 and audacity 2.3.2
Thanks for any advice :slight_smile:

What are you trying to do, listen to what you have recorded, or monitor as you record?
Where are your headphones plugged in?