Thread:JoePlay/@comment-31448629-20180728051751/@comment-171752-20180801164126

That image you want to use for a background is very small. I used Google image search and found that there are lots of large versions of that image. I would suggest trying one of the images that is 1600x1066. You can find plenty of good tips and advice on this topic at Help:Background.

For the favicon, you'll want to resize the image so that it's either 32x32 or 16x16, and you'll need to use a favicon generator to convert the image to .ico format. At that point, you can upload it using the theme designer. More information can be found at Help:Favicon.