I just read some of the manual and it says like most computers to hit delete when you see the message that says " hit to del to enter setup"
After that you will be in the bios. The screen shot shows it as the CMOS setup utility.
Go to advanced setup and work from there.
Turn HT frequency from auto and start at 200 and move up 5 or so at a time and see if it boots. Check temps and keep going. If it doesnt boot up right go back into bios and kick it down a notch and then run a quick stress test and then move onto longer ones. If it fails at anytime move the HT down and start over again. Rinse and repeat.
Also if you like move the DRAM frequency form AUTO. Down more than likely. As you increase the HT it increases the ram speed but ram doesn't overclock as well.
Here is your manual in PDF form. Start at page 18 and its pretty basic and not too crazy involved. Page 23 or 24 has the advanced bios settings page. Enjoy