imgur works fine but you has to put it as [img ]http://i.imgur.com/5WRDDHP.jpg[/img ] notice the i.imgur.com yours didnt have the i. in front
this is piccy im using;
if you uploads to imgur, let the piccy upload then click on the picture, itll just show the piccy, no border or imgur site stuffs, just the image, copy the url and put it in the img tags and done ^_^