The speed of your CPU is determined by the base clock times a mulitplier. For instance a 2800 MHz processor might have a base clock of 133 MHz and a multiplier of 21 = 2793 MHz. On some motherboards, including yours I believe, you can raise the multiplier and or base clock to get a higher CPU speed.
However, if you have to ask the question, then you shouldn't mess with this until you have read up extensively. More speed generates more heat. And in order to run at higher speeds you may have to increase voltages to get the system stable. This in turn generates more heat and the risk of damaging your processor from either heat or too much voltage or both. In general the Fan+heat sink that came with the CPU won't be adequate to cool your processor overclocked. You have to invest in an aftermarket CPU cooler. Even with all of that you have to do extensive testing od temperature under load and stability under load.
Use google and research overclocking and read the references already mentioned.