I have an invalid url listed under My Account page. When I go to my account's "My concrete5 Sites," page, one of the sites listed is obsolete and not in existence anymore. My ISP returns a 404 error when this URL is clicked.

How do I correct the my projects url to reflect its proper location?

For example, clicking on rondellaquila.com/concrete returns the 404 error. However, clicking on rondellaquila.com/photography works correctly.