1. Notify the group and/or moderators of any planned absences so that rps are not held up or disrupted due to abrupt changes.
2. No meta-gaming, which essentially is using the knowledge you as a player knows as something your character knows - you are both two different people.
3. The DM's word is final when it comes to in-game decisions. You are not allowed to reject something the DM has set into motion whilst in-game.