This what you have to do:
1.go onto campaign, menu and click on one of the scenarios
2.Skip the clip and quit the game.
3.go to editor
4.click on file and click on the option speaking alien babble and click on it.
5.scroll on the top until it says something like "test game" then click on it.
6.There should be on what playing to "test" as, click on one of the players.
7.Enjoy taking over Atlantis!