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"fn" stands for "function," and it's on the lower-left hand side of your Mac keyboard. "F2" is a function key, and it's on the top left on your Mac Keyboard. Type in: /Users/*Your Username*/Library/Application Support/minecraft/screenshots/ If you don't want your cursor or inventory showing up in the screenshot that you take, press F1. The debug screen will show your coordinates, entity count, and other things.

Summary:
Press "fn + F2" in order to take a screenshot while playing Minecraft. Find your screenshot by going to the following directory on your system. If you want to hide the heads-up display, press F1 before you take your screenshot. Press "Shift + F3" to pull up the debug screen before you take a screenshot.