How to connect the Internet to your home Wi-Fi
Go to the home screen and tap settings.
Tap Wi-Fi on the left hand side.
Find your network and tap it.
Enter your network's password and the iPad should connect to the network.
You know you are connected to the Wi-Fi when you see the signal strength in the upper left hand side (see green arrow). You should only have to do this process once. Your child's iPad will automatically find the home Wi-Fi in the future.