By clicking Details - Player Settings in the CliCli Editor menu bar, you can set the number of players in a game and the relationship between players. By default, a game supports only one team and one player (player 1). If you want multiple players to join the game, click New Player or New Faction in the window and drag players to different factions through the button. You can also click New to add Observer to the game, letting more people watch and enjoy the game together.
You can customize the colors representing players through the color sampler.