The black plastic caps simply pry off.
I would turn the needles out and inspect just to ensure a PO hasn't already broke them off, and they have the springs installed.
Then you can screw them all the way in...lightly. (the tips of the adjustment needle can break off if overtightnend)
Then turn them out. (richer). I would start w at least 2 full turns from bottom.
Park it on center stand. Put a box fan blowing on the engine. Start it up and let it warm up 10 minutes or so. Or ride it.
Then with it parked on center stand and engine idling as close to 1200rpm as you can get - dial them in OR out for fastest idle.
follow procedure in the Official Honda workshop manual.
Once done you can replace the plastic caps if you like.
If adjusting A/F mix doesn't make a difference in idle speed...The Pilot/Air-fuel circuits are clogged and need cleaned.
They won't necessarily end up exactly the same. If one filter is dirtier or dryer or has more oil in it than the other, etc, etc,etc.
These things can effect air flow differences.
Also, while it's idling. Check battery voltage.