New User- can’t turn off live radio

Hi. New User running:
Kodi with PLEX and NextPVR in the back end.

Went to addons for music and enabled PBS; selected MA and WBUR live stream.
Then I couldn’t turn it off. Pop up to left of screen wasn’t helpful and navigating around screen and back didn’t seem to pick up any other controls. Finally gave up and exited Kodi in order to turn it off.

What is the more graceful way to turn off a live streamed program?

thanks for any solutions you can provide,
Bob