Bruce, if you're on a Mac, command>shift>4 brings up an icon like a rifle cross-hairs. You can then drag it around to just copy a certain part of the screen, or if you just leave it and press the enter button it takes the whole screen. A click on the space bar then places it on your desk-top, and you can access it from there to post. Try it and see. I'm a bit rusty as to howe to do it in W10, but I think it involves holding the Command, (or whatever the main button to left of the space bar is called), and the print screen button, then going to desk-top and hitting Command V (or whatever the 'paste' function is on W10), I think.