Hi Dave and welcome to the forum.
I clicked your link and right-clicked on your shot, selected "copy image location" (on Firefox) and getting back here I clicked "Post reply".
You'll be addressed to a new page where you'll notice a big blank window (where you have to write your text) and above it small gray boxes.
click on the one written "Img"
you'll have something like this [ img ] [ /img ]
just click your mouse in the middle and select Ctrl + V (paste - that's what you had copied) et voila, your image is linked here like this: