Well that's a good question just click my home then click accounts then again click tools when you put all of that pick your picture & click browser and the picture well be in the background...& it well look pretty
How To Put A Picture As Your Background On An Iphone?
Press the Photos button, then press Camera Roll, then press the picture you want with your finger , then on the bottom left of the screen you will see a little box and arrow icon. Press that then press "use as wallpaper"