Nick

Just copy the web link address.  Then, when you reply or post a new topic, simply highlight the text in your post that you would like to associate the link with and click the little chain icon at the bottom of the posting box.  Copy the link address in the "link URL" box that pops up, click the "insert" button and your done.  I also like to make the link text bold so it stands out a little.

You do have to allow popups for the young turks site for this to work.