As Sharkû said, you cannot change your own status. Up to 500 posts, it changes automatically when you reach a certain number of posts; after that, the administration may choose to allow a personal title. (Those chosen are notified by the admins/moderators.) For more details, please check the
Barrow-Downs FAQ thread at the top of the Novices and Newcomers forum.
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth..
.'