Radvd can't start

[Morta]

How can I reset the config of radvd?

I'm not able to start anymore!

EDIT: On boot shows me that radvd start but not a link in services list in the webui

[Morta]

service radvd start
/etc/rc.conf: radvd_enable: not found
/etc/rc.conf: radvd_enable: not found
Cannot 'start' radvd. Set radvd_enable to YES in /etc/rc.conf or use 'onestart' instead of 'start'.

I have no rc.conf! I have /etc/defaults/rc.conf or a folder /etc/rc.d/ but there is no variable to set to YES.

[Morta]

With a file

/etc/rc.conf.d/radvd with radvd_enable=YES

It's running but no Link under Services.
Can someone post his /etc/conf.d/radvd file? Thanks!