Connecting to a video projector

I bought a projector and cable, but instructions are unclear. They say "You must find the 'FN' key on your keyboard, and you must also find another key that looks like a square computer screen." I can fn the FN key, but not the other. Is there some kind of substitute?

You are reading the instructions for a Windows PC. MacBooks automatically have the video port turned on. As soon as you plug the projector in you should see output. Then in System Preferences - Displays - Arrangement you have the option to mirror or extend the desktop.

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