With a Windows based program it's pretty simple. Basically you just open your program and find which button turns the CPU frequency up. It's that simple, you just move a slider.
There are other programs if that didn't work. Google for them.
Note that overclocking can damage components beyond repair. Please understand the risks and consequences of overclocking before you ignorantly attempt it and burn stuff out.
You will more than likely kill that chip if you aren't careful because it is not made to overclock. Chips now-a-days are built to handle it. Companies know that overclockability is a big selling point, so they make sure the customers will be happy. Old chips like that are not made for it.
If you still want to try, go ahead and Google for some programs. It's not likely that you'll find one that works anyhow, because they're newer programs made for newer systems.