master boot record

[J. Michael Morse]

You don't need to mess with the MBR.  I think what you are asking for
address in the second response.  Using Kate, Kwrite or some other text
editor (don't use Open Office, etc, make sure it is a text only
editor), open up /boot/grub/menu.lst and edit the file accordingly.

Don't let the file extension mislead you.  I don't think Linux really
uses file extensions.  The file ends in .lst and not .txt but it is
still a text file.

Try this at the command line:

sudo kate /boot/grub/menu.lst

and see if you can't go from there.

Good luck!