Where is the knock button for knocking? Paulo P. July 01, 2018 19:21 Updated Follow The Knock button appears on their avatar, when the player is able to knock. click for customer support Related articles What does knock mean? When is a player able to knock? What does Gin mean? When can a player go Gin? Is there any extra bonus for Gin? Where is the Gin button to go Gin? What are the Sets & the Runs? Comments 0 comments Article is closed for comments.