This is a simple guide on how to add a link on an eBay listing. I found it interesting that I couldn't find many things on this subject.
If you would like to add a link on ebay follow these instructions:
Make sure your description is on the "HTML" tab.
add this code: <a href="the website page link">how the link will appear</a>
so for example, my website is lightningcraft.com so if I wanted to add a listing to my website in my listing I would use this code:
<a href="http://lightningcraft.com">Lightning Craft</a>
Its that easy!
Hope this was helpful