Confused and Frustrated!!!

I have been trying for days to "customize" my blog with my own background.  I am doing what the video says and get an "error" code every time.  So frustrating!  But, what is weird is that while in chat last night, two different people came and looked at my blog and told me it has a blue background with raindrops.  What makes it weird is all I see is a plain white background.  If you read this, please leave me a comment as to what YOU see!  Thanks.