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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.
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.