On your keyboard, there should be a button saying something like "Print screen". After pressing that down, go and open of Paint. When you opened it up, there is a bar on the top. Next to one saying "Files" Since I have a danish version, I don't know what it called in your version, but it has something to do with changing something. Then press on it and look after a section saying "Paste" and press on it. Then the screen should appear. If you still don't know what to do, note me and I shall try to show you.