Home screen wallpaper change?

I have been trying to change my IPHONE 4s wallpaper for quite a while, and when I set it it doesn't seem like it changed it just looks like the original picture I put…
So If there's anyone that could help with that issue, please help As soon as possible!

When you click the "Use As Wallpaper" button, it should bring up two options: "Set" and "Cancel", and should allow you to Move and/or Scale the photo to your liking. Once you select "Set" it will bring up these options: "Set Lock Screen", "Set Home Screen", and "Set Both". Then you can set it as a wallpaper. I've never had an issue with setting a wallpaper.