The sign for "join" or participate is done by using an "H" handshape on your dominant hand and sticking it into a "C" handshape on your non-dominant hand.
JOIN / PARTICIPATE / "I'm in."
0:00 / 0:00
Memory aid: Think of the "H" hand as representing your legs and you are "jumping" into something with both feet.
Also see: CONNECT
Notes: