LOL...Did I mention that I am new to this?
OK--so I found the postbit_legacy, inserted the code in the same location otherwise, and voila, the image appears.
It doesn't open the gallery, gives a 404 error...So I'm going to have to work on the link to see why it's not working.
You ROCK!
Edit: Muhahahaha...There was a / instead of a . in the link. It works!
If you ever need help with aquariums...Let me know!