How can I turn a screenshot into a picture file?

The easiest way to accomplish this is:

1. Open the web page in the web browser. On Windows, press the Print Screen or Prnt Scrn key on your keyboard, found at the upper right of the keyboard. Betcha didn't ever notice this key before! This key will capture the entire screen. If your monitor resolution is set to 640x480, that's the size of the screen capture. If your monitor resolution is set to 600x800, that will be the size of the screen capture, etc.
To capture only the active window, press Alt + Print Screen.

2. Next, open up your paint program - you can use virtually any paint program, including Photoshop, Paint Shop Pro, Corel PhotoPaint, or even Microsoft's Paint, usually installed on Windows in the Start/Programs/Accessories/Paint.

3. In the paint program, select File/New, then Edit/Paste. Pretty simple, right? Your screen capture is now ready to be cropped or scaled. opposite direction.