I'd say you've "got it" Baz!
Am working them now. Here you go...
Go to
http://www.jigzone.com and sign in.
Click on "upload your photos" You have to create an album. The past that opens gives you some pointers too.
Scroll down and click "continue"
Click "choose photo(s)" and then upload
Your album page opens and go over and click the "share" button
Scroll down to "link to the puzzle gallery" and click on your album name
Pick your puzzle cut (above the thumbnails)
Go to the thumbnail for your puzzle and click to open it
Highlight and copy the "address" at the top and paste the link into a post.