Forum chat and MP
If you look at the main menu at the top left of your screen, to the right of it you will see 'User CP' and then 'Forum Rules' and then 'Chat'. If you are logged in and click on 'Chat' you will enter the forums chat room already logged in as your forum name.
IF you wish to play a MP game, enter the chat room, and wait. You can minimize the chatroom and play other games, surf, watch TV etc. When a person enters you will hear a chime. If we all do this whenever we want a game, then we may find it much easier to find an opponent when we want to play, without having to schedule a game in advance.
Of course the chat room is an excellent place to meet for scheduled games, for exchanging IP's, and for talking to each other before, during and after your game.