The guest access is a feature on the Cisco wireless router that allows a visitor/guest access to the wireless network. The password can be found on the main computer (the one used to set up the router). Click the windows icon (or OS equivalent) click all programs, scroll down to Cisco, and click on it. A menu screen will open. Click on guest settings to view and/or change the password.
You can find the guest password by going to all programs on the computer, and then clicking on Cisco connection. You should then click on guest settings from the window that will appear to be able to access the password. Consult a computer technician for more details.