Hey Glenn,
Have you used the hyperlink button?
You'll find it in the quick reply box, it is a "world" symbol with a "link" symbol. It is the sixth symbol/button from the left in the Quick Reply area.
The same button appears in the WYSIWYG editor when you click "Post Reply" instead of doing the quick link at the bottom of the page.
Click the button, paste the link into the pop up box, and you are ready to go!
Best,
Ron