They do contain a reference for copying the code into the message, but the images shown in the tutorial do not visually demonstrate this. I would recommend making changes to the tutorial, but my gut feeling is that 99% of people using the ImageShack tool on this site don't read the tutorial. They simply upload the picture and then assume the forum software is going to automatically integrate it into the message, which the software does NOT do. Hence it would be a waste of BWJM's time to fix the tutorial.
Just a suggestion on the tutorial: I think it should read something like "Once your image is uploaded you MUST copy the img code from one of the two fields and paste it into the body of your message"
I think some people are reading it, but aren't totally clear that the second step is mandatory to make your image visible.
Anyway, cool note and curious to know what the actual date is.