What do I do when a player joined a match but did not turn up?

If a user has joined the game and did not turn up, you can report the user as a ‘no show’, within 48 Hrs of the activity, which will negatively impact is Reputation rating on his profile. For this, go to Play > See Gamebook (Below the particular activity) > Click on the Users’ Profile > Toggle No Show Button

Please note that no show will reflect in the Players profile only if a majority of the players playing in a particular match mark the player as No Show.