If ye' are talking about the title underneath your name, then I'm going to say that you cannot change it manually. It all has to do with the amount of posts you make, and that is how you may rank up. Breaking free from the Newbie rank, you must make 25 posts and you will be promoted to a Jr. Member. Bumping your post count up to 50, you make your way up to Sr. Member and so on. ~