Cpanel- How can we solve the problem "Unable to login FAQMasterFlex admin area" ?

How can we solve the problem "Unable to login FAQMasterFlex admin area" ?

This might be due to 'register globals =off'. Because of that, the server variables must be expli
citly pulled into the script in order for the authentication to work. Add the following two state
ments to admin_authorize.php, just above the "if" statement that tests their values:
$PHP_AUTH_USER = $_SERVER['PHP_AUTH_USER'];
$PHP_AUTH_PW = $_SERVER['PHP_AUTH_PW'];