After you click the Battle button, the battel menu opens. At the top of the right side you can select the opponent of your choice. At the bottom the game server is looking for an opponent for you. It compares the number of crowns won by both of you. To provide a fair chance of winning, only players with a comparable number of crowns are matched.

You can also use the leaderboard to select an opponent. A green light beside the crown shows who is online. Whoever is not online can be attacked as well. Use the Facebook tab to connect with your friends.