If your personal user has admin-rights you should be able to log on and reset the admin-password through the settings. However I guess you don't so you might have to reset the settings.
To reset everything:
http://forum.subsonic.org/forum/viewtop ... eset+admin
Alternatively you could stop subsonic, locate the database-script file which I believe is imported whenever you start subsonic, edit the file and replace the admin password with the same hash-string that your personal user has. After you restart subsonic you should then be able to log on as admin using your personal password.