the easiest way is to just copy the url for the LO you based your work on into the body of your description. The text will autmatically become a link once you submit your information.
for example
http://www.scrapbook-bytes.com
The other way is to use HTML code. That's when you have text that represents the link.
for example
SBB
To do this you need to type
{url=http://www.scrapbook-bytes.com}SBB{/url}
but replace the curly brackets {} with straight brackets [ ].
If I do that here I'll autmatically create another link. LOL
HTH and feel free to PM me if you need more help/explanation.