seems that you're 'really' not familiar with linux
i presume you're using kde, gnome would be not far diff
this is not a clever suggestion, but i still have time to just type
log as root
open a gui-based text editor (u don't seem to quite understand the cli),
my favorite is kate (in your kde menu, go to accesories, there u find something named *text editor* , kate, kwrite or whatever)
once you get to it, open file /boot/grub/grub.conf . it's not hard, very windoze feel to open file.
there go you go, edit what ever u want, save and run grub-install command line in /sbin
if you don't have a gui text editor, open terminal, goto /boot/grub/,
type vi grub.conf,
hit i to enter insert mode
edit what ever you want
and install your grub.
fuhhh i feel idiot writing this
also check 'info grub' for better info