Okay, well, simply put, the CPU frequency will just be a combination of two values in the BIOS.
The FSB speed x the Multiplier.
For your chip it's going to be 266x9 = 2.4GHz at stock. Now the multiplier will be locked upwards, meaning the only way to go is to up the FSB.
So that's what you need to do. Keep putting the FSB up in small increments, whilst keeping an eye on stability and CPU temperatures.
It's child's play, honestly.