First of all >gaming on a laptop
Secondly, the graphics card is more likely to be your problem than the processor. If you upgrade your i5 to an i7, you're unlikely to see much of a difference, if any.
Thirdly, are you asking if someone can help you upgrade your laptop's processor? AFAIK, laptops have very little room for upgrades when it comes to hot, power consuming components like CPUs and GPUs. They usually have only just enough power and only just enough cooling to deal with the parts they were built with. You'd probably find that you'd have even worse overheating and battery life problems than gaming laptops usually have if you upgraded the processor. I'm not saying it's impossible, but don't be disappointed if you run into problems.