Click the Airport icon in the menubar. It will drop down a menu showing the available wireless networks. Choose CFANet:
After clicking CFANet, you will recieve a box like below requesting your password. Enter the Network Key you were e-mailed:
After typing the password, click OK, and you will be online!
If you haven't requested the network key for CFANet, follow this link to have it e-mailed to you:
Request Network Key for CFA Wireless