What I did is add them to my bulletin. To get them to show up as links use the HTML code:
<a href="http://www.YOURSTORE">YOURTEXT</a>
Add the website to your store between the quotes and your text between the arrows. If you want a space between links add: </br>
Hope that helps
This is how mine is set up:
Places to Find Me: </br>
<a href="http://www.zazzle.com/photographytkdesigns">Zazzle</a></br><a href="http://www.facebook.com/photographytkdesigns">Facebook</a></br><a href="http://tracie-kaska.artistwebsites.com">Fine Art America</a>
You can see what it looks like if you go to my store and look at the bulletin on the left hand side:
http://www.greetingcarduniverse.com/PhotographyTKDesigns