How to enable su  in FreeBSD?
This  is my  installed  FreeBSD 9.1
$ uname -aFreeBSD FreBSD-Unixmen 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec 4 09:23:10 UTC 2012 [email protected]:/usr/obj/usr/src/sys/GENERIC amd64$
try  to make  su  to  other  users
$ su - root su: Sorry
Go to sudo ports directoryÂ
# cd /usr/ports/security/sudo # make install clean
add  the  user  to  the  wheel group
vi /etc/groups
$ cat /etc/group # $FreeBSD: release/9.1.0/etc/group 218046 2011-01-28 22:28:12Z pjd $ # wheel:*:0:root,pirat9
save  and  exit
Try nowÂ
$ su - Password: [email protected]:/root #
That `s all.
