mouht r/w partition with ZFS

[Carmel]

I made a serious error in my rc.conf file. I was trying to configure a
wireless network. Anyway, upon boot-up, a message pops up that the
network was created and then the  system freezes. Nothing works, and I
have to manually shut the system down.

Now, I can get onto the system in single use mood, but the system is
read-only. I have tried "mount -a", but that does not help.

This is a ZFS filesystem. How can I get read/write access to the files,
rc.conf specifically?

-- 
Carmel