Change the Wi-Fi network of Chromecast or Chromecast Audio . Make sure that your mobile device or tablet is connected to the same Wi-Fi as your Chromecast or Chromecast Audio. . Open the Google Home app . . Tap on your device Settings . . In the Device settings menu, scroll down to Wi-Fi, then tap Forget Forget Network. . Follow the setup steps to set up your device on a new network.