If its like most laptops you should have a "Fn" key, probably in blue. It will correspond to buttons on the keyboard. Pressing this button and another button at the same time will cause things to happen. Like adjusting the brightness, volume, monitor outputs, etc.
For my laptop the Fn button is on the lower left, while the volume adjusts are the up and down arrow buttons.
FN, found it!
No documentation came mentioning this button...that is a bad thing.
thanks for tip