@FOUND SOUL,
Don't hit URL! Don't type URL!
Hit img in the BBCode Editor, that should give you [img][/img]. Then place the photo link/url between those two brackets. Don't hit img again!--just hit Preview and see if your image shows up.
Just make sure you have only one [img] before the photo link and only one [/img] and nothing else after the photo link (delete any extra [img] or [/img] that may show up).
Try it again. I know you can do this