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If you are the sole user of the site, then you probably already know you can change your password by clicking the ‘admin’ tab and selecting the ‘site admin’ tab under that.
However, if you are not the primary or first registered user on the site, and are not granted admin access (only ‘Publishers’ and ‘Managing Editors’ have that access) then you have no such ‘admin’ tab and as such, you may think (like I did) that you cannot change your password.
Ah, but you can change your password. Point your browser to ?event=admin
e.g. http://textpattern.org/textpattern/index.php?event=admin and you will find (as long as you are a registered user on the site) that you do have access to that panel, after all.
Site owners, if you would like to know how to protect your list of authors from being viewed by everyone, then visit the entry on Hiding the Authors List.
thanks to Manfre for this