includes/config.inc.php
search for 'SEARCH_FRIENDLY_URLS' => '1',
change the 1 to a 0
search for 'SEARCH_FRIENDLY_HTML_EXT' => '1',
change 1 to a 0 (it might already be a 0)
or... you can go to
http://yoursite.com/forums/admin (assumes your forums are in the 'forums' directory), login and edit things.
the admin cpanel doesn't get involved with spider friendlies, so it can be manually just URL'd to
