Syntax error in rc.conf - cannot fix

[lrnobs]

I am setting up a new server so I could just reinstall, but this is a
learning opportunity.

I was changing the hostname of the computer.  In rc.conf I apparently left
the leading " off the name.

BSD doesn't like this. It stops the boot and allows/forces me to a shell. So
I found that "cat" shows me the error of my ways.  vi apparently doesn't
exist or is stored somewhere that I cannot find because "find" does not work
either.

I did find "ed" and thought I would be learning how to use it, but alas
trying to launch it tells me that I have a readonly file system.

So, is there any way for me to fix my typo, or is reinstall my only option.

Thanks,

Larry Nobs