paradocs - allow me to answer so that people who really know will feel obligated to correct me with a better way

It has to do w/ the URL you're entering FT on to begin with, but that's another story..

When you're on the page where you want to copy the URL, right click on your mouse, choose "properties", select the URL text, then hit ctrl-C to copy the URL that shows up - this is the complete URL for the thread.. then go to where you want to paste it, left click your mouse to put your cursor there, and hit ctrl-V. Voila!