First of all, put the ambient_generic in your map where you want it to be heard. Select it and go to properties. A name is unessasary unless you want something else to trigger it. Under "path/filename.wav of WAV", browse by clicking on "..." and select your sound clip. NOTE: ONLY wav. sounds will work! I assume that you understand he rest. "Not Toggled" means "not looped". That's mainly used for triggers.