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If you have a Wireless Internet router just connect up using your password (WEP key) if not then you'll have to either get the USB adapter, Get a wireless Router, or find a Nintendo WiFi USB Connector to plug into a computer that's connected to the internet (& is also near the Wii).
To get a wireless connection, some companies offer free wireless routers with their internet packages.
Just get one of them and terminate the subscription ASAP, and you're done!