Thank you so much, everyone. It definitely wasn't in the customize drop-down box.
Ctrl+A worked, but I am really a point-and-clicker. Following instructions, I found it under Home>Editing, R clicked, and voila! it's right where I wanted it to be! In the meantime I checked, and I definitely do have 2016. Someone mentioned "repair"--does that mean reinstall?

Thank you again.