Fn Lock works perfectly, but how can I activate wifi on/off? about fn-key-lock HOT 1 OPEN

If your key is a hardware switch -- It can't be done via the Fn key lock.

However you can try this approach -- Get your hex key code for the physical key and put it inside the fn lock:
Ex - if your key code is 34 you can put SC34 inside fn lock with your preferred key (Remember to put the SC in front as this will let the Fn-Key-Lock to treat it as a code instead of number)

from fn-key-lock.