First You press the [Print Scrn] Key Circled Below and Located above your [Insert Key] (also an another way to take only a screenshot of the active window is [alt]+[Print Scrn] it saves you time editing the image)
Then you go to Start >> Programs >> Accessories >> Paint as shown below on XP Home Edition.
Once you have Paint Open Go to Edit > Paste (or Ctrl + V) and your sceenshot should appear.
Then Save the Image, File > Save and name it what you want and you can email it to me ( g6qwerty at gmail dot com Subject "RPGWO Screenshot") or your feinds