TP-Link Deco M9 Plus - Add More Decos; Select Model and Follow Setup; View Added Decos

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Wi-Fi Settings
Customize the network name and password of your main network or create a separate network just for guests. You can set a guest network name and
an easy-to-remember password. You can shake your device to share the network details easily with family and friends.
Enable a guest network
Create the network name and password Shake to share