Frustrated

I've been messing with my Blog today trying to change things around. I thought a winter or Holiday theme might be a nice change. So much for that idea! LOL
I wanted to add a background image & couldn't remember how to do it. {Yes, it's been that long since I've changed my Blog!} I wanted to have the background stationary & the text scroll {Like Brenda Smith's Blog. I love how this looks!} So I did a Google search for a tut. I found a great one, but for some reason, the background image was not showing up. I tried several different combos of code that I thought might work ~ & nothing. Then I thought maybe my image is too big. But what size do I make it? I had no idea. I know it can't be that difficult, I've built websites for goodness sake. But today Blogger has beaten me down! LOL
So, since the girls are begging me to feed them {darn those kids needing to be fed!! LOL} and I've lost patience w/ it, I quit for the night. Maybe I'll try again tomorrow. Maybe.
PS ~ if anyone knows how to do this, I'd love to hear your tips ;)