How do you increase my computer volume through my computer keyboard?

If you are talking about with your keyboard, it would depend on your keyboard.

Some keyboards will have a "Fn" key (in blue usually) between "Ctrl" and the "Windows" key. All you would have to do then, is just hold "Fn" and then the key with a little blue speaker symbol with big waves coming from it (to raise the volume) compared to the another speaker symbol next to it (usually before) with smaller waves (to lower the volume).

It mainly depends on your keyboard because different keyboards have other keys that will control a variety of things.