No, you don't have to have any number of posts to C & P. Here is how I do it. There might be a better way, but nobody has learnt me how to do it any other way.
Put your cursor over the pic you want to copy, right click, left click on "Properties". Right click on the URL, left click "Select All", right click on the URL again, left click on "Copy".
When posting in a thread, left click on the IMG box above. In the box that comes up, delete what is in there, then right click when your cursor is in the box, left click "Paste". Then click OK and you are done.
Sounds more difficult than it is. Good Luck