Go to Settings

> Wi-Fi, then turn on Wi-Fi.
iPad automatically joins known networks.
To join a new network, do one of the following:
Join an available network: Tap the name of the network. If asked, enter the password.
Join a hidden network: Tap Other, then enter the name of the network, security type, and password.
When iPad is connected to Wi-Fi, a blue checkmark appears next to the network name, and

appears at the top of the screen.
If your Wi-Fi doesn't appear, check your router connection