Find the picture you want to post and click on it. The on the right a box will appear with various links in it. Just copy the IMG link, and paste it here in your thread.
That used to work for me BUT now when I click on the picture I don't get the "copy" function after clicking the IMG link.
The only way it works for me now is; I have to double left click the IMG link in the thumbnail pic until it highlights blue, then I right click the IMG link and the copy feature appears. Then I can paste it anywhere.