Quite often when I am helping someone with their website, I will ask them to send me a screenshot of what they see on their computer screen. If they happen to have SnagIt or another screen capture utility, they will usually know how. Others have no idea. This came through on a mailing list I am on so though I would share it. The article comes complete with screenshots.
Built into both Microsoft Windows and Macintosh operating systems is an easy way to capture the contents of your computer screen into an image file, often referred to as a “screenshot.”
A screenshot can be helpful when you are trying to obtain assistance as it allows your support person to see exactly what your computer screen was showing (a long error message, for example) at the time the screenshot was taken.