You cannot define a new game because your null level does not allow you to play more than 5 games at once and you are already playing (including your game invitations) 5 games.
You can solve this unpleasant situation by upgrading your membership.
(hide) If you are interested in a progress of a tournament you are playing, you can discuss it with your opponents at this tournament's discussion board. (HelenaTanein) (show all tips)