Christmas Tree lights can be hung on a tin roof using hooks or nails. First, identify where you want the lights to be hung. Then, attach the hooks or nails to the roof with a hammer. Next, carefully loop the lights around the hooks or nails, making sure to secure them firmly. Finally, test the lights to make sure they are working properly before turning them on. And remember, safety is key when hanging Christmas lights on a tin roof, so be sure to follow all instructions and use proper safety equipment.