Backgrounds on Blogs

I have realised, not that I didn't know it already, that I HATE READING INSTRUCTIONS. When I am trying to do something I want the 123 and not some technical jargon that I have no idea what it means. The minute I see all ?/hp ^ @#$ = XYZ.. I get in a complete state and my mind says I CAN'T DO THIS. I am sure the left hemisphere of my brain does not exist! I think I would make a great teacher... to grade 1's. because that is how I like to learn. If anyone can give me the 123 as how to place a background to my blog it would be greatly appreciated! I have made a background according to all the instructions, but putting it onto my blog is another story. I am not one who enjoys spending hours to try and do something... I guess I just don't have the time, so short and sweet works for me.