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.