Setting up a TP-Link Deco mesh Wi-Fi system is simple using the Deco mobile app. The app guides you through connecting the primary Deco unit to your modem, creating a Wi-Fi network name (SSID) and password, and adding additional Deco nodes for seamless whole-home coverage. You’ll download the app, sign in with a TP-Link ID, connect the Deco to your modem, and follow the on-screen instructions to complete the setup.