First do a "Search in Templates" find out which template uses that template hook.
Look at the name of the hook it tells you.
PROFILE - This means the members
profile page so
member.php ?
MINISTAT -
Mini-statistics block
LIST - The
list section
vBulletin make sure they name each one to give as much information. So know you know what file it will probably execute in you can choose a hook from there.