Print screen using a Mac keyboard

It's not that I didn't like them. From what I read of them, I do not have a F13 key (or 14 or 15 etc, come to that), I'm familiar with, and use, the relevant key combination when using Mac's OS, and I'm not technically savvy (or confident) enough to mess with code. I also have neither the time nor the patience to roadtest every Google link.

The tip offered by MasterOfNone seemed perfectly reasonable until I tried it out. Unless I've missed something, I didn't see any other suggestions.

HM