Can someone please help me. I have downloaded screen shot captor and now I'm stumped. Say I have some text on my computer screen. I know if I use print screen I can capture the whole screen but I can't figure out how to use shift prtscreen. I try that and I get a square with a bunch of grid lines and horizontal and vertical dashes on the screen. I can't figure out how to copy the desired region to the screen shot captor screen so I can manipulate it.

Sorry to be stupid but could somebody get me started.

Thanks a bunch.