OK there are many different methods in Honda manuals for adjusting the cam chain but here is a method i have used for 30+ years which works as long as the tensioner is operating as it should and the camchain still has useable life.
(1) Find a method of turning the crankshaft, this can be
(a) Kickstart
(b) spanner on nut on end of crank
(c) rotating back wheel in gear
Or any other none destructive method you can find.
(2) Put pressure onto your turning method so that the engine is just about to turn but not quite turning.
(3) This is the difficult bit, Whilst holding that engine possition loosen the cam chain adjuster locking bolt/nut and re-tighten. That is the bolt/nut that actualy locks the tensioner not the one that stops the lock undoing!
If the chain is stilll noisy try again in a different position, if its still noisy either the adjuster is siezesd or at its limit and/or the camchain needs replacing.
Have fun.