I don't know what BIOS this motherboard uses (Award or AMI), but the procedure is similar.
You must download the new BIOS and the Flash program. You can also use the program that comes with you motherboard's CD.
Copy the program and the BIOS image to the same directory and run the program. It should ask you if you'd like to backup you current BIOS and then ask you the name of the new BIOS image file, complete with extension (DOS 8.3 format). After entering the filename the program checks the BIOS image and (if ok) asks confirmation to start flashing.
Sometimes the progress bar may stop for a moment during the flash. Don't reset your computer, wait till it's over. Don't flash you BIOS while overclocked, it's a risk not worth taking.
Good luck.