In this settings any logged demo-USER can reset the whole BOARD by clicking on related link below.
...or delete as site-admin single lines, just by typing in name field logged and click Post by leaving all other fields empty
  To logout as site-admin, just click again on Post, by leaving the name field as logged, to return in the active normal posting-mode :-)

You could password protect your file reset.php in order to manage the border as SITE-ADMIN and delete any posted-line you would not like to be shown, this is just a demo and it has been set as such to make it easy for anyone to test its features as administrator.