All you have to do follow some simple steps and you are all good. If there are some issues with your device while doing the login and setup, you can easily resolve them using the troubleshooting steps provided with the setup guide.
If that does not help, you can reset your device to the factory default version using the reset button.
For that, you have to find the reset button and then press and hold it for few seconds. Your device will reboot and you will be set to the factory default version.