Ow, I see now. And who do you go to to get your costum title? Or does the command to change it anytime becomes available when you hit 10,000 posts?
Like Ricebox said, it has to be requested from the CMs. Reason being is that the CMs set the 10,000 post title to Azzylike, which doesn't appeal to those who have reached 10,000 posts so the tradition was made to allow those players to have custom titles.