When you open Screen Monkey you will presented with a window
containing 6 blue boxes.

Now find a supported media file on your computer (a jpg
image for example) and then simply drag that file onto one of the blue boxes.

If it was an image
you dragged then the image will start loading and the box will turn red. Now
simply click on the red box and the image will be displayed on the screen.

To clear the screen again just click on the red cross.