Becareful with right clicking and getting the url, and posting it inbetween theYou find a pic online, and you can save it and upload it to Photobucket, which is free...
Or you can right click on the picture and go to Properties, then copy the url and paste it here in between these [ img ] piccy here [ / img ] but without the spaces
Or another way is if you save it to your computer and then attach it in a post