There are various ways to do a print screen (or screenshot) but it depends on your computer.
On Windows operating system, you often can push the PrtScn button on your keyboard. Windows also comes with a program called Snipping Tool; search for it on your Start menu.
On a Mac, press and hold the following keys together: Shift, Command, and 3.
If those tips don't work, try searching online for the name of your computer and "screenshot."
