You may need to scroll down to find this option.
At the bottom of the network list, choose Other Wi-Fi network. To proceed, scan the QR code found on your camera or doorbell. Select the camera or doorbell you want to update. On the Nest app home screen, tap Settings. WEP VS WPA SECURITY CAMERAS UPDATE
If you want to change from your current Wi-Fi network to a hidden network, or if you have recently changed your hidden network’s settings, update Wi-Fi information in the Nest app.
Select your Wi-Fi network’s security: WEP, WPA or WPA2, then type in your password. Type in your hidden Wi-Fi network's name. Follow the instructions to connect your Google Nest camera or doorbell to the app. Nest app Connect to a hidden network during setup On the Wi-Fi setup screen, select Other Wi-Fi network.
Follow the setup steps instructions in the app. Note: When you choose to unpair your device, this will delete all your video history. You’ll be taken back to the Home app home screen. At the top right corner, tap Settings Remove device. If your camera or doorbell is connected to an existing Wi-Fi network, but you’d like to connect it to a new one, follow the steps below: Type in your hidden Wi-Fi network’s name, password and security type ( WEP, WPA or WPA2). When you reach the Wi-Fi network selection screen, select Other Wi-Fi network at the bottom of the network list. Follow the setup instructions to connect your Google Nest camera or doorbell to the app. Home app Connect to a hidden network during setup