[SWLUG] Resetting root password

[Neil Jones]

I have an ubuntu system which is new and it doesn't seem to recognise 
what I thought was the root password.
I am trying to edit the grub loader to append the word Single as several 
websites recommend.
pressing e in grub takes me to an editor but I don't know how to save 
anything. I can go back to the grub menu but nothing
is saved.

Any ideas please?

Neil