¿How to start VLC stream using RB1100AHx2?

I recently bought this I would like to try using RB multicast

How to start to relay a simple video (for example, *.avi infinite loop)?
What do I need? I searched on wiki but do not understand at all …
At the moment, i have just installed & pim multicast package

Schema:

VLC Server<------->RB1100AHx2 (PPPoE Server)<-------->Clients (SXT or NSM5 )

¿Where find some explanation, tutorial, or something that help me?
Regards!

Anyone? Only i need a simple explanation to start…
Regards!