Russ,
Just copy the url of the link/thread you want to post; when you open the "reply to thread" window, decide where you want to place the link, put your cursor there, then go up to the bottom row of symbols at the top of the reply box, select the "Insert Link" icon (little blue globe with link) and click on it. Paste the link url into the open box, click OK, and then finish your post as normal. You can do a post preview to see if the link is there and it works, prior to submitting your reply.
