If you don't understand any of it at all, not even that voids aren't called voids or what if or include mean, then you have no chance of successfully changing it to do something different without a lot of studying. Have you done any programming? In C++? Or what computer language?
BTW in English we use some CAPITAL letters. Also we write in sentences with punctuation. Without them it is very difficult to understand what you are trying to say.
Steve