Each PC Regent has their own dedicated private messaging area accessible to only the Player and the DM. A list of PC regents can be found in the PC Regents thread . Look there to see which characters are available to play and which characters are already taken.
  If you are interested in joining the game, you will need to create a free account on Tavern-Keeper and submit your request to join in a Private Message to "Argent". Once you are accepted into the game, you will be given exclusive access to your character's Message Board (which will appear in this Private Messaging area).