[Zope] Simple Directory of URLs

I use your product called Simple Directory of URLs. (http://www.zope.org/Members/Roug/SimpleURLs) The thing is that I want to query for one more item other that Title, URL, Description and Section. I want to be able to add for example "Contact email" and "Alt. URL" and maybe more later. I don't know much at all about ZCatalogs, but I guess that one can simply add another field to the NewEntry object, (??) since all fields are sent to a object called CreateEntry and the code does not depend on form-field-names. I experimented a bit with the HTML but my harmless changes does not appear! even after restart.