drag your cursor over that string until all is highlited
click "image" on the left tabs
your string will have img at the front and /img at the back surrounded by [ ] brackets...
(can't put the brackets in this instruction because it will try to post a photo)
hit preview before you post to check...
this method is quick---the only downside is these pictures will disappear if the host service no longer hosts them....if you save to your computer and upload to IHUB as Flo indicated, they should stay forever...