User Feedback :: Change GRUB files in /boot directory, how?

Can't change GRUB files in /boot directory. I want to choose booting in DOS or DSL from my 512MB flash drive. Any ideas how to do that?
I'm new in Linux...

Mount the boot directory of the usb drive

cd to that mounted drive (possibly /mnt/hda?)

go to /boot/grub
vi grub.conf

save and done

Brian
AwPhuch

original here.