You have to make sure they are both connect to same network. My wifi doesnt reach to where I have my box at the moment so cant use it but before it used to connect and work straight away. Just entered ip user and pass. Really simple.
Your box's ip for both if your streaming direct,you will also need Daroon player as it seems to be the only player capable of playing a direct stream,its available in the market
has anyone ever used androiddreamer - apparantly you can stream to your android mobile no matter where you are through http - but i dont know how to set my settings it asks for a dyndns etc which im not to sure about