No sound out of headphone jack output - is there a system setting?

Professional headphones, 1/4" jack, works perfectly in my DAW and elsewhere, plug into the headphone jack of the Kemper profiler head - silencio. Nothing stipulated in the manual, unless I missed it. A few threads here were mismatched to the problem. Any assistance would be appreciated, just got the Profiler a week ago, which is otherwise running perfectly.

Cheers!

Hi Bayou, that worked, many thanks for the prompt fix. I am very new to the Kemper - I pressed the System button, and scrolled through 18 pages to no avail, could not locate output settings. Lesson learned, activate system, click on Output button, configure outputs. Check.