But first of, for what exactly do you need? What's your purpose at showing in top of the screen an image? Furthermore, you could read the image function reference because it's pretty easy to do so that you've mentioned.
Note: That line of code only adds in the center of your monitor screen an image. For the top, just add another image function and change these two variable values (the last defines how we want a specific image supposed to be so in this case 2 - as HUD so don't touch it).