Have you never flown before? Have you no common sense? Is a JFK comment board really your first choice for good travel information? Had you not considered first searching the website that you're already on? Contacting the airline? Checking your ticket? Or perhaps even waiting until you arrived at the airport to consult one of the many conveniently and very visibly located directories that must surely be available to you? What on earth do you think everyone else does?
***
It's Terminal 3.
Have you never flown before?