Well, if you misplaced your wifi disk (like i did) you can install it by going to this URL. Took me a while to find this but i will post this here incase some of you may need it 
http://www.nintendo.com/consumer/systems/wii/en_na/onlineUSBDownload.jsp
http://www.nintendo.com/consumer/systems/wii/en_na/onlineUSBDownload.jsp