[Zope] fingding problem in using ZCatalog

Hi Everybody... I'm trying with ZCatalog. I've installed it properly and after creating one ZCatalog object, when I'm trying to click on it, it is asking for user name and password even though I'm super user for the Zope. It is showing the problem as unauthorized. I didn't get the point what I did the wrong. Pls. point me in right direction. Thank you in advance, Regards, Chandra Sekhar