Oh well thats easy all you need to do is go to customize profile. Then you'll see a button that says page background so you click it. then a box will pop up and at the top you will see chose image. so you click on it and then it will tell you to pick an album that you want to use your pic from. and then you can chose the image you want. then hit the chose button. and after that hit submit. then at the very top hit save.