What operating system do you have? Windows 10?
There should be a small speaker icon in the lower right screen corner.
You should be able to click it and find your way into the audio settings screens: "Playback" for example.
There can be any number of windows, tabs, and properties available t change.
However, depending on the quality of your speakers you may not be able to do much adjusting.
Take your time, explore the settings first. Then change only one setting at a time. Keep notes in case you need to go back and undo some change you made.
Another way:
You can also get to sound settings via "CTRL" + "I" > Devices.