Connect at least one Restaurant Wireless Hotspot
computer to your router using a wired connection. You will not be able to access the Wi-Fi password through a wireless connection. Open your Web browser and enter the router IP address. You can find this in your router's documentation. Enter your user name and password. They are usually set to "admin" and "password." Access the "Wireless Settings" menu and your "WEP" key displays in that http://slashdot.org/story/06/06/27/130239/5-Social-Wi-Fi-Router
window. The WEP key is your Wi-Fi- password.
If you are having difficulty accessing your router provided to you by Comcast, you could contact their technical support for home networking. This only applies if you lease your router through Comcast. If the router is your own, contact your router manufacturer for additional assistance.
References:Comcast: Configuring Wireless Security