You need to find the volume control, which is built into the keyboard. (the location is not always the same for every laptop)
Download the entire manual for the computer from the manufacturer website. It will show you where the keyboard controls are.
Look in the bottom right corner of the screen, see a speaker icon? Click on that.
It brings up the master volume.
See the "mixer" button in the volume control window?
click on the mixer and adjust the audio levels.
Open your audio software and check all the settings.