Can someone please help with some instructions as to how to configure Rioplay to configure new Shoutcast streams.

What ideally I would like to do is point it to a local Shoutcast or Streamsicle server.

TIA.

You need to untar the streams.cfg from the .arf file, delete it from the arf file, modify the streams.cfg file with the changes and add it back to the receiver.arf file.
To be honest, its much easier to user tRio, i use it it to tune into streamsicle and shoutcast at the moment