Few Guidelines to setup router or extender:
1. Make sure your device is plugged in
2. Connect Ethernet cable between router and modem.
3. Restart your modem as well
4. Connect an Ethernet cable to computer as well.
5. Now it's ready to set up.
Nighthawk Ext Wifi Setup App help you to setup different models of dual band, tri band netgear nighthawk routers and extenders.