It is very easy to use Autumn Wallpaper, just follow these instructions:
1. Select a background from the first screen. You can find them under "Select background" on the top of the screen.
2. You can also choose what elements to animate the screen by pressing the next circle next to "Select background".
3. Click "Apply"
4. Click "Set wallpaper"
5. You are done
*add new wallpaper