'Linked Players' is where you see all the players that you have linked to your account.
You see the number of rounds each player has entered; you can tag them to be a part of a custom group which helps you filter your ranking results; you see their current subscription; you can turn email notifications on/off; clicking on 'view player' takes you to the player dashboard; and finally you can unlink a player by clicking on the red 'X'.
