This is a very easy game to play.  Open Duckhunt83 in ion and when you get to the main
screen press enter.  It has a brief key guide for the game. 
2nd SHoot
Del Pause
Mode Quit

To un-pause it just tap enter.  
Use the arrow keys to move the aimer around till it is on the bird, and then press second.
Its just like the Nintendo game, only no dog (sorry)