How to change a processor in a laptop?

You can't change a processor or a graphic/video card in a laptop. The only things that can be upgraded in a laptop are the hard drive and ram (if not already upgraded to the max). This is why when you buy a laptop you buy it with the specs you need for the programs and games you plan to use. I like to play some games on my laptop, so when it's time to buy a new laptop, I always make sure it had enough ram, the right processor and the dedicated graphic card.

You appear to be confused. EVGA is a video card manufacturer and Geforce is a trandmark for Nvidia who also makes video cards, not CPUs. CPUs are made by Intel or AMD. The two are not interchangeable. Normally laptops are not upgrade-able