Using KPPP for all user

Hi (again) list, I used to run KPPP. When I tried to run it, I got this message: === You don't have sufficient permission to run /usr/sbin/pppd Please make sure that kppp is owned by root and has SUID bit set === I tried (oddly) to use chown and chmod so users can execute it (/usr/sbin/pppd), but i failed. How can we (users) use KPPP easily? I'm sure i've cofigured KPPP correctly, because when i tried to connect with KPPP, the exit status was 3. Recently i'm using wvdial as root. Thanks, Adinda Praditya