@ossobuco,
Well, my how-to note was probably too terse. EhBeth is right, in that the url has to end in jpeg, gif, or possibly some other photo type indicator.
Meantime, for all the newbies, particularly Sandra - here's a crostata di mele e mandorle (apple and almonds) -
Another hint - to find the source of a photo on a forum, with a mac, just click on it at the same time you click on control, and then choose Open Image in a New Window. Look at the url above. This one is from a Flickr account, and the website is shown on the photo. Sometimes following the links will lead to a lot of wonderful photos and interesting people. If you have a pc, I think you get there by clicking (what, I don't remember) and selecting properties...