Thank you thistimethisspace, it finanally worked. I still don't know what I did wrong. I've been working on this for a couple of hours and I'm certain I tried earlier typing it in from scratch in my process of trial and error. Sorry about not using backticks.
If I may give my 1.5 cents, there is a touch of ambiguity in the instructions (mind you, I do not know HTML from Swahili). If the line, "Here are some you can link to" were replaced with this line, "You can replace "”image-location”" in the code above with the one of the lines below:", it would have saved me about an hour of time. Also, when the instructions state, "Do not copy and paste the link above!", my first thought was to type every character in from scratch, but my second thought was that maybe I was just being reminded to replace "your-blog-name" and "image-location". Anyway, thanks again.