The ip address lets VLC Streamer know where to contact your computer that is running VLC.
The simplest address to use is the IP address that is shown in the VLC Streamer Helper. You do not need to enter http://
Alternatively, if you know how your network is setup, then you can use your computer name on the network. This might be something like 'RobMac.HomeRouter' or just 'RobMac'.
The app will automatically add the port number to your manual address. By default, this is :54340, but if you are using a different port, you will need to specify it.