Easiest way is by having someone monitor the registration for you while you adjust - this can be done from either radio - just watch the CH0 and CH1 registration and adjust for best signal. You will need to do both ends of the link to get the best result.
You could do it your self if you can juggle a tablet/laptop, ladder and sxt but not recommended for safety
The goal is to get both Chains similar (not always exactly the same but they should be pretty close, say 0-3dB difference) and the signal as strong as possible (i.e -40dB is better than -50dB).
Using the LED on the station end works to a point but does not show the deifference between Chains.
Hope this helps.
MTCNA, MTCWE, MTCRE, MTCTCE, MTCSE, MTCINE, Trainer
Mikrotik Distributor - New Zealand