Go to WAN>>>Internet Access
Select 3G/4G USB Modem (PPP mode) under WAN3
Then click the Details Page
For APN Name type “telstra.internet“ (note this info is available from the ISP)
Click apply and ok
To check the connection status go to Online Status >>>> Physical Connection
WAN3 Status should show an IP and Up Time in green text with TX and RX activity.