How to quit when playing in background

[leorob]

I'm new to bsplayer and use the "play files in background" option on my android tablet. (allowing me to browse the net while the audio or video is playing in the background).
I can't figure out how to quit the application when I do this.
Using the back arrow still has the file playing in the background.
(Of course I can pause the playback...but this is not the same as quitting the app.)
Hopefully this is something simple I am overlooking.