Directory ap: "Sign Up" not working

Any idea why the theme/ap doesn't allow people to sign up?

Link: http://www.tamraexcell.com/directory/

The directory was installed with the standard theme that came with the plugin. Let me know if you would like the link.

In the settings, the permalinks was changed from default to the name of the post; this helped get a person closer to being able to sign up (thanks Patrick!), but still not quite there...

Originally requested help over a week ago, so I really hope there is a fix to make the ap work correctly.

Thanks!