Tip:
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Swipe down from the notifications bar, tap the "Settings" icon
Tap "Wi-Fi"
Slide the switch at top-right corner to switch on/off the Wi-Fi
Tap the network you want to connect
Enter the password then tap "Connect"
Long tap the network you want to forget
Tap "Forget network"
Tap the "Add" icon at the bottom to add the hidden network
You can fill in the information and tap "Save"
Slide the switch at top-right corner to switch on/off the Wi-Fi