Every time I set a picture as my wallpaper on my Samsung, it forces me to crop the image as a square or horizontal rectangle at best. After looking up online, all the answers say "download an app" or "change the size." I am an illiterate when it comes to that sort of thing, so I was hoping for a really dumb-ed down version. Where do I get this app? What is it called? HOW do I change the resolution, and if I need an app, back up to the other questions. Please help!