Keep reading. There is a post, Multi NAI I think, that will guide you on how to use Internet Sharing w/o having to use extra software. You will need a USB cable. There is another post explaining how to use the Wi-Fi but I just use the USB cable.
Read Luv2Chill's post about half way down:
http://forum.ppcgeeks.com/showthread...lti-NAI&page=4