Basically, work out where securelevels have been set, adjust that setting, and reboot. Provided your security-paranoic predecessor hasn't also locked that down.....
The general way is using rc.conf. there are two securelevel settings there:
Code:
kern_securelevel_enable
(bool) Set to ``YES'' to set the kernel security level at
system startup.
kern_securelevel
(int) The kernel security level to set at startup. The
allowed range of value ranges from -1 (the compile time
default) to 3 (the most secure). See init(8) for the list of
possible security levels and their effect on system opera-
tion.
Best of luck......