GRUB is extensively documented in the grub info pages. Simply type info grub on the command line to browse the GRUB documentation. More information can also be found on the GRUB home page [http://www.gnu.org/software/grub/].
The main GRUB module page displays each of the currently configured kernels and operating systems that GRUB will list in its boot menu. Clicking on a kernel will open a new page displaying all of the configured options for that kernel, where they can be edited. Clicking on the Edit Global Options button will allow you to configure options that will apply to all bootable kernels and operating systems.
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