I'm not terribly computer literate, but manage. I've found some info on sharing, but nothing about Facebook. Using manual and many searches, but no success. Some computer terminology is confusing to me.
If you have the Facebook app installed (you don't need to), it should come up in the Share list when you tap the Share icon.
If you mean by photo copy you mean you want to capture exactly what's on your screen, it's called a screenshot and they are saved in the Screenshots folder in Gallery.
To take a screenshot hold the Power (right button) and Home button together.