http://www.scancapecod.us/livescan/feed_tutorial.pdf They have a wonderful tutorial on how to setup a feed. It's what I made mine by. Tells you everything you need to know about Icecast, Simplecast, SHOUTcast, and using text tags.
Click on your router. Click on Winamp Audio Streaming. (You must assign a valid static IP address to the computer running Icecast.) Post in the forum if you have any problems and Bob or I will do our best to help you.