1. Check your /etc/rc.conf
zfs_enable="YES"
2. Start service
# service zfs start
3. Create pool(s) on your drive(s)
# zpool create disk2 /dev/ada0
4. Create storage directory on pool and set it write permissions
# mkdir /disk2/wrstorage2 # chmod 777 /disk2/wrstorage2
5. Add this directory as WolfRecorder storage
6. Now just use it
7. Also you always can check your ZFS pools status with following command
# zpool status