Sarge, the "Custom User Text" there changes every time you write a post, but you can also set it to whatever you want. Hit the "user cp" button at the top of the page, then hit the "edit profile" button on the page that follows. You'll get a page of things you can set up, and the custom user text is about halfway down that page.
(User cp stands for user control panel, but that's not very clear.)
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