Ok, first of i'll start by explaining what overclocking is. It's basically that you push your CPU, GPU or RAM to higher clock speeds then intended by the manufacturer to squize out a little extra performance. This does however come with a risk of damaging your the component you're overclocking.
The way to overclock is basically that you increase the multiplier that with the base clock controlls the clock speed. You'll also need to increase the voltage that runs through your component as it'll need the extra voltage to maintain a stable clock. Unfortunetaly increasing the voltage will also increase the temperature and since you are on a laptop with limited cooling this could result in high temperatures that could damage the system...