Note: This section will walk you through capturing a portion of your screen but, if it is easier for you, you can use Shift + ⌘ + 3 to capture the entire screen.
macOS has a very versatile screenshot function baked right into the OS (it's even more powerful if you're running macOS Mojave or later). To access it, press Shift + ⌘ + 4. That will turn your mouse cursor into a crosshair. Now you can take that crosshair and click+drag a square on your screen. When you release the drag, whatever is in the rectangle will be captured as a screenshot on your desktop.
Note: This section will walk you through capturing a portion of your screen. Windows also has a legacy screenshot function bound to the Print Screen key, which captures the entire screen to your clipboard (use Alt + Print Screen to capture just the active window). Once captured, you can paste ( CTRL, + V ) the image directly into your support email, if that is easier for you.
Every modern Windows 10 installation comes with a sketching app called Snip and Sketch which is what we can use to make screenshots.
Note: Windows 7 and 8 installations have an app called Snipping Tool that takes screenshots. It works the same as Snip and Sketch, but it looks a little different.
To open Snip and Sketch press the Windows and start typing "Snip". It will appear after a couple of letters. Select it from the search list to open it.
Once open, click on the New button in the upper left corner.
This will darken your entire screen and turn your mouse cursor into a crosshair. Using that crosshair, drag a rectangle around the area you want to take a screenshot of.
When you release your drag, the screenshot will appear in the Snip and Sketch window. Press the 💾 button to save the file.
That's it, easy peasy. We are looking forward to your screenshots. :)