GRUB DualBoot

I installed SUSE93 on a disk that already has MDK91 on it, but SUSE didn't detect other OS's on the system during install. I haven't used GRUB before, so where is the config file and what do I put in it to add these boot options (from lilo): image=/boot/vmlinuz label="MDK91" root=/dev/hda6 initrd=/boot/initrd.img append="quiet devfs=mount acpi=off" vga=788 read-only other=/dev/hda3 label="Win98SE" table=/dev/hda