I just got here.

At the home page, there are a list of games you can choose from (Get there by clicking on the navigation bar title at the top left corner). Click on the one you want to play and you will be taken to the game screen. There you'll see some input fields for a room code and display name, the game board, some game info and a restart and leave button.

How to Create/Join A Room

Within a game screen, type in a room code of your choice. It should be a bit special. This is the code your friend will use to join the room. Type that along with your display name and press submit, and that should be it. Both fields must be 30 characters or less.

What to do when in a game?

Click on How2Play on the navigation bar to get game specific rules. The rules of each game are mostly standard, so if my description isn't enough, you can always look the game up. Once you create a room, you can make the first move but will have to wait for an opponent to continue. You can also play locally if you have a friend beside you or want to play against the computer, but you shouldn't join any room for that. The first person to join a room becomes the room leader. The room leader is the only one who can restart the game. When a room leader leaves, the leader role is reassigned randomly.

Other stuff

When you leave a room, depending on the game, the game state is saved until the room leader restarts the game. You are disconnected if idle for about 30s.