I am a big noob. How do I use it? Do I download it? The most advanced thing I know is how to clone something from github using cmd, so you get the idea. Thanks

I have noticed that the R and L button glyphs are present in the reserved ghyps png files. However, they do not display properly:

This is how it should look on a 3DS:

Also noticed the ZL and ZR buttons are missing.

The "DPAD Left and Right" button also doesn't display properly, but it is present:

The code points for all of those are:
R: \uE053
L: \uE052
ZR: \uE055
ZL: \uE054
DPAD Left and Right: \uE07E