Connect Orbi Router to Home Network
The router should be connected to the home network modem with the Ethernet cable. You just have to connect the cable to the router WAN port (Yellow port) and Modem LAN port. After that, you can turn on the devices and start syncing the router to the satellites.
Sync Orbi Router to Satellite Nodes
To connect the router to the satellites, you can... https://wificrunch.com/how-do-i-sync-my-orbi-router-and-satellite/