Php & mysql question

Hello! I have little problem. I am trying to acces a database through php, but I cant figure out what “mysql_connect” address I have… Does anyone know where to find it if I am a www.one.com user ?

mysql_connect(“crcdesign.se”, $username, $password);
@mysql_select_db($db) or die(“Unable to connect to database”);
echo “goood”;

BEST REGARDS!
HANDYMAN