As this is a new Motherboard (I know from a different thread) you should have a manual or you could download that as well then you would find the info you require in there.
So look at the manual, in the download version you need to look at Chapter 3, 3.2.2 ASUS EZ Flash 2 utility. I have always found this easiest. Make sure you downloaded the latest.
Ps. Did you find the Realtek HD Manager?