<Check it on Apple official site>

https://support.apple.com/en-gb/HT202639

<Connect to a Wi-Fi network> ※Your Wi-Fi Device 「ID & Password(WPA)」 is written on the back of the device.

From your Home screen, go to Settings > Wi-Fi.
Turn on Wi-Fi. Your device will automatically search for available Wi-Fi networks. (if you can not see Wi-Fi ID, please try Turn ON/OFF again)
Tap the name of the Wi-Fi network that you want to join. (you can find it on the back of the wifi device)
Before you can join the network, you may be asked to enter the network's password. Please find Password (WPA) on the back of Wi-Fi device.

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Further details for connection

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🆘【Trouble shooting】

If you can’t connect to wi-fi, please once reset the device. Check the below out for resetting.