How to program the knob to do anything I want?

[Itz-kavish]

Hello! We ordered about 8 of these boards of our class. So far, we have soldered 2 of these boards and made them work. I looked at the github files and there are only two available codes for the knob, one that scrolls and other one code that controls the volume. I wanted to edit the code so it can do anything I want like horizontally scrolling a page, or switching tabs on a browser. Can you please guide me on how to program the knob do it can do anything I want.