After login, you get to the main game window. You are initially in the chatroom. If you want to play, join one table, wait for all four players. Pressing NewGame to start new game. Also you can watch one player, just input that player's number into the right-buttom textfield and then press the Watch button besides it.
Every player can only has one watcher.
Watching is not available until confirmation about the request. You may accept the request or just deny it. In the chatroom, you can talk to All or a specific guy, which means you can chat with someone privately. You can NOT talk to your partnter privately in the game since that may cause cheating. Start button is to start the game.