How do I adjust limbs.simple_tentacle to finger? My question derives from the given link here..

PitchiPoy Rigify missing finger controls

I am trying to change from "simple tentacle" to "finger" have no "rigify type" option available, and just writing finger into the "rigify_type" down on the right doesnt change it..



thats what I would like to have.. -->



How do I do this?
Thanks for the help :)
Change limbs.simple_tentacle to limbs.simple_fingers