Tip:
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Swipe down from the notifications bar, tap the "Settings" icon
Tap "More..."
Tap "Mobile network sharing"
Tap "Portable Wi-Fi hotspot settings" to edit the settings
Tap "OK" to confirm
You may change the Name(SSID), security and password here
Tap the checkbox beside "Portable Wi-Fi Hotspot" to enable/disable it
Tap "OK" to confirm
Back to "Mobile network sharing"
Tap the checkbox beside "Portable Wi-Fi Hotspot" to enable/disable it