This is my example of replacing the background of a photo. To replace the backgroud of a photo, you must unlock the photo and use the quick secection tool to selesct to body, then go to the top menu, click select- inverse. When the outside of the photo is selected you can delete the backgroud. Next, open a photo of a background that you want and drag the photo with the deleted background to the background photo. Resize your image so it looks more realistic. If you want you can add a text box from the costum shape tool and then add some text.