Right click your wireless adapter, go to properties, and go to the Sharing tab - enable both sharing options ('Allow other network users to connect through this internet connection'), then use an ethernet cable to hook up your MAG directly to your PC. Have your PC connected to the internet via a wireless connection - then, open up the Network and Sharing center, and head to 'Change adapter settings'. Here's exactly what I did - this is assuming that you're running a computer that has an ethernet port, a wireless connection, and is running Windows (if it doesn't, I'm not sure that I can help).
