Forums / Cotonti / Extensions / Support / How i can use just forum module ?

How i can use just forum module ? i don't want use all cms system just i want use like a forum !! i was chaned forums.php and index.php but not correct working :( other any idea ?

Siena forum like this url:  http://www.site.com/index.php?e=forums

my cotonti version Siena 0.9.14

note: sorry i open topic wrong category..