The Manual: http://files.dlink.com.au/products/DSL-X1852E/Manuals/DSL-X1852E_R1_Manual_v1.00(AU).pdf
Have your PPPoE username, password and NBN Service Type handy as you follow through to this configuration guide.
IF your NBN Service Type is FTTN (Fibre to the Node) or FTTB (Fibre to the Building). Then plug one end of the phone cable in the DSL Port (indicated as 9 in above diagram) and the other end to the phone socket on the wall.
IF your NBN Service Type is FTTP (Fibre to the Premise) or FTTC (Fibre to the Curb) or HFC (Hybrid Fibre Coaxial), plug one end of the ethernet cable to the WAN Port (indicated as 8 in the diagram above) and the other end to the NBN Box Port.
Connect the power source and turn the router on.
IF you are connecting the your computer or smart device via WiFi, locate the WiFi password at the base of the router or from the card insert (card insert picture below). If you decide to change the name of the WiFi SSID and password, you may if you wish put those details on the card.
Once connected, move on to Step 3.
Locate the admin password at the base of the router.
In a browser, type 192.168.1.1
IF this is the first time you have logged into the router, you may get the following after you login. Just click on the X as shown in the diagram:
After that, you should have a screen like this:
Hover your mouse over Settings and then click on Internet.
IF your NBN Service Type is FTTN or FTTB, then select XDSL under the Configure your WAN Connection. And goto the following Guide: https://helpdesk.fantel.com.au/en/knowledgebase/article/configure-d-link-dsl-x1852e-router-for-fttn-or-fttb-nbn-service
IF your NBN Service Type is FTTP or FTTC or HFC, then select Ethernet. And continue to the following Guide: https://helpdesk.fantel.com.au/en/knowledgebase/article/configure-d-link-dsl-x1852e-router-for-fttp-or-fttc-or-hfc-nbn-service