You need to post YOUR photos on something like photobucket, then you access the properties when you right click on the photo. Ok, if you want to post a photo that is in the public domain, right click on the photo and copy the entire URL. Go to reply window and type:
Preview it and it should work.
I don’t know what you typed when you said “type: something” because when you typed that, instead of displaying what you typed, it displays an empty picture frame. So what did you type?