Does it reset the Mega when you press it?
If not, post a photo of your board. See this Simple Image Guide
cjha: I am new to Arduino so I don't really know if that button resets the board. Here is the image of my board, the button is marked in red in the top right corner.
The Arduino system is great for learning-by-doing, so why not try out the button and see what happens. Run a program that prints a message in setup(). If the message appears every time you press the button you will know that it is resetting.
PS... I have suggested to the Moderator to move your Thread to the Project Guidance system. There is a big sign saying PLEASE DON'T POST YOUR QUESTIONS HERE at the top of the Introductory tutorials section