monitor HTTP-URLs

Hi,

Basically I have two HTTP-URLs to monitor. login.php and content.php. Username and password were passed via POST method. I would like to check "Welcome" string in content.php, to ensure that username and password have been processed successfully into content.php. After thousand and million of attempts (just kidding... but I'm trying very hard for testing), the application cannot process the parameters, where "Welcome" string cannot be found. When I clicked on content.php under Monitor Information page, it displayed login.php. Shall I input parameters in the optional field or at the bottom (Basic Authentication)? I have tried both but none of them work. By the way, I also monitor HTTP-URL sequence for others, which use NTLM authentication (they are working perfectly). I also have done prerequisites for SSH and NTLM. Any suggestion? Thank you.