No sound from my headphones

[threewanderers]

Hello, I just bought a behringer umc202hd interface. I am on windows 10. I downloaded and installed the driver, and plugged in the interface.  the good news is the latency went from 78.9 to 4.2 with the interface.  the bad news is I am getting no sound over my headphones, which are plugged into my computer's headphone jack.  I can't hear my guitar or any sound through the jamkazam app, although the indicator lights are all green.  Any suggestions as to what I'm doing wrong? I feel like I am so close.....