In the BIOS Setup screens under Integrated Peripherals, go to the On-Chip ATA Devices line and hit Enter (see Manual page 3-11). In the sub-menu, make sure that the SATA ports and controller are Enabled. You do NOT need to enable RAID on another line.
Back out and go to the Standard CMOS Features - manual pages 3-6 and 3-7. Page 3-6 shows a menu in which the 2 possible IDE devices are clearly different from the 6 possible SATA devices. Is that how your screen looks? If you have your devices connected to SATA ports, that is where they should be on this screen.
Now go to the Advanced BIOS Features screen, Boot Sequence, and hit Enter. If you hit Enter again on the 1st Boot Device line, you should get to choose which item is first. Having done that, if you want to have a second choice, it seems you need to select Yes on the next line. Then I assume (the manual does not say clearly) you will have some way to select that second device. For example, many people would set the optical drive as the first choice, and the HDD as second.
If the SATA devices show up on the Standard CMOS Features screens as SATA devices, but are changed to IDE devices on the Boot Sequence screens, don't worry. I have seen several BIOS's the incorrectly label SATA devices as if they were some kind of extra IDE device beyond the first real IDE devices. I call that bad labelling, but it does not actually cause a problem with the operation.