
1. Press the Print Screen button located near the insert and the F12 buttons at the top right corner of your keyboard. (may be shortened down to Prnt Scrn or Prnt Screen etc.). Also make sure that you don't copy any text between these steps or this will not work as it saves the image in the same short term memory as it saves your copied text.
2. Open up Photoshop, Paint or whatever image editing software you have and press the Ctrl and the V buttons simultaneously on your blank canvas or picture.
3. Crop your photo using your image editing software so you only get the bit you wan't and then save. See, simple.