When i use the add-on to import the background images i see nothing in the view-port at first I have to UV unwrap it and then set the view-port to textured. I feel like I am doing something wrong here.
Just position the 3d cursor where you want to import the picture as plane. Choose the top view for the 3D viewport (View, Top) and choose textured for the viewport shading. You don’t need to UV unwrap anything.