Hi @josephtanner,
Welcome to TPG Community!
If this an NBN compatible router for NBN Fibre to the Premises (FTTP) service, all you need to do is configure the following settings:
Username: <Your TPG username>
Password: <Your TPG Account Password>
Protocol / Encapsulation / Connection Type: PPPoE
Should you need assistance in accessing the router's settings, you may refer to this user manual we have found in Google.
Netgear
Nighthawk X6
AC3200 Tri-Band WiFi Router
Model R800
User Manual
http://www.downloads.netgear.com/files/GDC/R8000/R8000_UM_8Jul14.pdf
