To configure a guest network with the Google Fiber app
1. Touch Network
2. On the Guest network card, touch Manage network.
3. Touch the toggle button to turn the Guest network ON or OFF.
4. You can update the Guest network name or Guest network password .
Make sure your guest network's name is different from your primary network's name.
You can touch the eye icon 
5. Touch Save when finished. The following message "Network settings updated." will appear at bottom of the screen.