To reset the password of the camera, you need to reset the camera itself.
While the power is connected, press and hold the reset button (located at the right side of the camera) using the reset tool (looks similar to a SIM ejector tool) for 10 seconds.
NOTE: Resetting the camera will lose all settings like motion detection, Wi-Fi details, and password. That means you need to do the setup again.
Watch this video to help you with the setup. Interface may be different due app updates since release: