F5 or F+5?

Ok, today in Flash 1 class, the teacher says to "stretch your frame" (i think?). Anyway he said "The easiest way to do it is to hit F5" then some lady say F5 or the "F" key and the "5" key at the same time or the "F5" key. Ok, now I can see this as being a legitimate question but there is no way anything will happen if you hit the "F" key and the "5" key at the same time. I mean seriously, c'mon!