You also can't seem to find how to turn off your caps lock button.
Using all caps on the internet is the equivalent of yelling in someone's year - it's extremely rude.
Have you looked for a function or "fn" button? My guess is that the volume controls are somewhere along the f1 row, but require the fn button to be held.
That being said, why do you need them? All they do is control the volume in windows, so you get the exact same result using them as if you just turned the volume up normally.