If you are running the script from your home computer, then you will need to add your IP/domain to the user you want. Goto Goodies->Mysql, pick user, and at bottom add IP.
Just noticed. A connection string in PHP is
mysql_connect("db_name.domain.com", "db_user", "db_password");
it looks like you've entered the machine name (yoda) instead of the db name... unless yoda is your database name.