In the Editor sidebar, look under the collapsible panel called Players and private information. This panel lets you add or remove players, rename players, and change each player’s range of private information.
If a player does not have a name, the player will appear in the game tree as Player 0, Player 1, etc. You must have at least one player, so you cannot remove the last player.
“Private information,” “private items,” and “range of private information” all generally refer to the same thing. The concept is that each player has some range of possible items, each with an associated probability. Each player is holding exactly one of these private items. While the other players don’t know which private item the player is holding, they do know the player’s initial range of private information and the initial probability associated with each item in that range.
Any time the player makes a decision at a Decision node, the decision can depend on which private item the player is holding. For example, if the private information represents whether the player is weak or strong, the player may go in one direction when weak and go in another direction when strong.
Each player must have at least one private item, so you cannot remove the last private item.
Each private item must have a probability associated with it. The probabilities for a player’s private items should sum to 1. If they do not, they will be scaled so that they do sum to 1. This can be useful if you want to enter the probabilities as relative weights. For example, if you enter “2” and “3” for a player’s two private items, this will automatically scale to 0.4 (40%) and 0.6 (60%) when you save.
Remember to press the Save button any time you make changes to this panel. Otherwise, your changes will not be applied to the game tree.