User's Manual

7.2.2 Launching submenus
A submenu contains additional options for a field parameter. To
call up a submenu, simply move the highlight to the desired field
and press the [Enter] key, or click it with your mouse key. The
submenu will then immediately appear.
If you are a first time user or are not familiar with BIOS Setup
programs, it is highly recommended that you take a few minutes
to familiarize yourself with each of the submenus and their
corresponding functions. If you accidentally make unwanted
changes to the current configuration, go to the Exit menu and
select Discard Changes.