To setup TP-Link Deco WiFi Routers , you should use TP-Link Deco App.
Setup By Mobile App:
Download the TP-link Deco App for your Android or iOS smartphone or tablet from here.
Connect the modem to Deco Router.
First, power off the modem. Connect your Deco to the modem by using Ethernet Cable. Then power them both on.
Select the router’s location.
Select a location for this Deco.
Create your WiFi network.
Set a network name (SSID) and a password for your new Wifi network.
Add more Deco routers.
You can add more Deco routers to expand WiFi coverage. You can add more deco routers one by one through this app.