The easiest way I've found to copy something is to right click, OUTSIDE the picture, hit View Source and look for the post #. You DO have to know some html, yes, but once you know to look for the < img........> it's real easy to find. I still can't link worth a darn, nor can I go to another site and pull a pic. Probably cuz I haven't tried, eh?
The URL for the image can also be found by right clicking on the image and selecting properties, which will bring up a little window with some information about the picture, including its URL. Then in your post, you use that URL as in: