Copy and paste doesn't work all the time with our forumm software. It depends on the length of the link among other possible things. The way to make sure it works is to use the link button on the "new topic" page if your making a new thread, or on the "full reply screen" page if you're posting a link as part of a response to a post.
“Life’s journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy ____…! What a ride!’” ~Hunter S. Thompson