If there are many games listed, at the top right of the window there is a search box where you can type "Grand River".
Click on the game you want to enter the registration area.
You must have a valid ACBL number included in your BBO profile to play. Just like regular club games, you have the opportunity to earn masterpoints in these games.
Make sure you are online and registered with your partner at least 15 minutes before the game is scheduled to start. If you are joining your first online game, make sure you and your partner register at least 30 minutes before the game.