What do you want to change about it? They show on screen in your menu the way they are listed in the grub.cfg file. If you want to change which boots by default, change the entry in /etc/default/grub file:
You will see a line like the one above. Change the 0 to whichever default you want. Counts from zero rather than one.
If that's not what you're looking for, be more specific.