TP-Link Deco M5 - Set Up Your Deco; Deco App Download and Installation; TP-Link ID Login or Signup; Modem Connection to Deco

Plug in your device: Unplug old router from power. Unplug ethernet line from WAN port of old router
and plug into either port on the first Deco mesh. Plug the Deco into power. Select next.
IMPORTANT: Make sure to choose “I don’t
have a modem” on this screen.