For a player to be able to deliver the quest (If autocomplete is not checked), the desired hand in object needs to be set. This is done in the quest settings, and will be the object the player has to go to to deliver the quest, This object also gotta have a radius, to which will be used to determine how close the player as to be to deliver the quest, and receive his reward.

When you have selected your hand in object, the quest script will when starting the game, attach the necessary collider and data. Which means you don’t have to do it manually.