I posted the above picture directly from the internet. You don't necessarily have to use the method described above.
This is what I posted in order for that picture to show:
[XimgX]http://www.israelmilitary.com/images/mossad.jpg[XimgX]
For the picture to show, the upper case X's must be removed. In other words, before the "http:" letters you put "img" in brackets. At the end of the link, which in this case ends in ".jpg", you put "/img" in brackets.
I hope I explained this clearly. If you need further explanation, please don't hesitate to ask... because it can be confusing.