What you are trying to do is called overclocking, and there are some excellent guides for that on the internet, like here: http://www.compunamics.com/overclocking.htm
I suggest you read this before proceeding the overclocking.
You can open the BIOS (press a key like F1, F2, F8 or del during startup). Somewhere there will be a menu with options for voltages and frequencies (units in V and MHz)
As you have read, processor speed depends on the multiplier and front side bus speed: CPU Multiplier x FSB = CPU frequency.
Right now, your frequency is 2200 MHz (presumably 11 x 200)
To get it to 3000 MHz (3GHz), you either have to raise the option called FSB in the BIOS to 270 (270 x 11 = 2970), or increase the multiplier to 15 (200 x 15 = 3000). Before you do so, write both the values down, so that you can reset to them, in case things go wrong.
I sugest first trying to raise the multiplier from 11 to 15. It may however, be locked at 11. If you can get it to 15, you're done, your CPU is now running at 3 GHz.
If not, you'll have to go through some more trouble.
First, you'll need to find your memory (or RAM, or DDR) multiplier and frequency, in the same menu as the FSB and CPU multiplier. Write them down as well.
As you have also read, increasing the FSB will make your CPU and memory go faster. This may however, be too much for the RAM to handle.
With the FSB frequency and multiplier, you can calculate the frequency of your RAM just as with the processor.
You will now have to change FSB from 200 to 270, so you'll also have to calculate a new RAM multiplier, if you want the RAM to run at the same speed.
For example, your RAM frequency can be 200 (FSB) x 2 (multiplier) = 400. If you then increase FSB to 270, your RAM will run at 300 x 2 = 600. You will have to lower the multiplier to get as close to 400 as you can get, and preferably lower, if 400 cannot be achieved.
Having done this, you can slowly start to increase FSB, I would suggest by 10 at a time. As soon as the PC has trouble starting, in the BIOS, increase the CPU voltage by one step, until it runs stable again. However, as your CPU is rated at 3GHz, you shouldn't have any trouble with this,and should not have to increase voltages.
If you encounter any probems, let me know!