Actually, you only have to change it at the top.
$mssql = array(
'host' => "localhost",
'user' => "sa",
'pass' => "password"
);
It will auto-fill down below with what you put in these.
$mssql = array(
'host' => "localhost",
'user' => "sa",
'pass' => "password"
);
It will auto-fill down below with what you put in these.