[Help]Watter

How can i allow my players to place lava and watter im using Wolrd Guard. This is my config right now.

Code:

groups:
    default:
        default: true
        permissions:
        - factions.participate
        - iConomy.holdings.others
        - iConomy.help
        - iConomy.rank
        - iConomy.list
        - iConomy.payment
        - iConomy.holdings
        - iConomy.access
        - essentials.tpdeny
        - essentials.tpaccept
        - essentials.tpa
        - factions.create
        - essentials.warp
        - essentials.motd
        - essentials.help
        - essentials.list
        - essentials.warp.list
        - lwc.flag.*
        - lwc.modify
        - lwc.unlock
        - lwc.remove
        - lwc.create.?
        - lwc.create
        - essentials.msg
        - essentials.spawn
        - myhome.home.soc.others
        - myhome.home.soc.list
        - myhome.home.soc.private
        - myhome.home.soc.public
        - myhome.home.soc.uninvite
        - myhome.home.soc.invite
        - myhome.home.basic.delete
        - myhome.home.basic.set
        - myhome.home.basic.home
        - essentials.signs.use.buy

 

I'm having the same problem. I don't seem to find the answer.
Also, one of my users, just told me that he pick'd up water, and turn into LAVA. I mean, WTF?