When a site uses an ASP form using the "Post" method, I cannot connect to the site using an URL parsing the parameters with ? and &.
Please help me with this!!!

You can't put values in the URL to login when using post. The post method stores the information in the HTTP header and is not accessible from the address bar. If the calling page used get, this would be possible because get stores the information in the address bar after the character '?'.