If you want to change the WiFi network OtO is connected to after you've already set it up, simply go to the Device Settings from the Account Overview or Device overview page.
Note: You will need to change the network credentials over Bluetooth, so you must be beside your OtO device so you can press the switch.
As of app version 1.3.3, (July 28) users can also manually input their Wi-Fi network:
For more information about Wi-Fi, check out our Wi-Fi: Troubleshooting Guide
For more information about Wi-Fi, go to: Wi-Fi Setup Guide