To capture a screenshot, click somewhere on the screen that shows the score/error/item. Press Alt + PrtScn (button in upper row near the right corner of your keyboard) at the same time. Go to your email and Paste (right click and choose Paste or use the keyboard shortcut Ctrl + V). If your email client won't allow you to paste directly into the email, open up a Word document and use the same technique to paste the screenshot. Save and name the Word document then attach it to your email.
You can find instructions and a helpful video for capturing screenshots for both PC and Mac computers at: