As soon as you turn your computer on tap F1 imeadiately (several times).
Generally the button you push to get into the BIOS is different on MOST computers. I suggest F1 to you because that is what saw Award uses in their BIOSs.
If that is not working look for something on the screen imeadately when you power up it should say "Setup = F10" for example.
FYI,
I don't think your motherboard even supports RAID.