Need some help on use the cachemgr.cgi, thanks!

[余信达 <dewiop22@xxxxxxx>]

Hi all, 

I set up squid 3.2 on my server of Centos. It works fine, then I want to see the cache information, so I put the file "cachemgr.cgi" in my apache dictionary "cgi-bin".
However, when I visit the URL: http://myproxyserver/cachemgr.cgi, there are many forms that need me to fill in. They are host, ipaddress, etc.
Whatever I enter the password, it says wrong, so I am wondering where can I set the password and username of cachemgr.cgi. 
I haven't  edited any file about the cachemgr.cgi yet. If anyone have any idea, please tell me. 

Thank you very much!!

Regards, Xinda Yu