Adding the image to a comment would be fine- but hwo do you do that? The link you sent does not make any sense to me!
right click the cell
right click on the shaded border
colours and lines
fill / colour / fill effects
at this point, you'll be directed to your normal file directory structure from which to pic a picture file
I'd reccommend Ivan's site - he produced a solution to a picture / comment query I had a while back which I'm still using today *and* am still grateful for !