My hyper-link does not show up in the drop down menu

Are you looking at the right one - if it's the link in email then you want to watch clicks link in email versus link on a web page

Is the link has never been clicked, it might not show up. See artivle: http://community.marketo.com/MarketoArticle?id=kA050000000Kyu3CAC. To solve this in the past, I just created a temporary landing page with all the links and I went and clicked them all. They immediately showed up. Don't forget to unapprove the landing page once you are done. 

If the link is an .ics file, it will not appear. When asked to enter the link, use " contains .ics". This will show you anyone who clicked that link.

If it is not an .ics file, I think Alex has a great approach.