Zen Cart 1.3.9g

I'd like to add a link within the product description that allows users to click to "listen to samples". The problem is I can't figure out how to make the link active.
I can put www.mysite.com but it's not an active link.
Same for http://www.mysite.com.
Specifically I'd like to add a link that says "Listen to Sample" and have that be the anchor text.

How do I do that?

Dry Aquaman