Read it but it only talks about the screws that adjust the overall height and not those specific black nobs. Besides, they don't seem to have like a hole for a screwdriver
First advice. If you do not know what is allen key, or pole screw in humbucker,
it is better not to adjust it by yourself until you gain more experience. You can make more damage then benefit.
Here is tutorial.
Find the biggest allen key that can fit into the hole.
Turn clockwise to screw in or anticlockwise to screw out.
Plug your guitar to preferably clean sound with least amount of compresion and listen string to string volume. If most of the strings are about same level and one string is too loud or too quiet you can adjust it by this procedure.
But if I am at your place I would not bother.
Just play.
You have great guitar.
Find tabs of your favorite song that you dont know how to play.
And when you learn it, your guitar will sound much better the before.