Link of previous instructions: https://helpdesk.fantel.com.au/en/knowledgebase/article/how-to-configure-d-link-dsl-x1852e-router-for-your-nbn-service
Click the Advanced Settings...
Enable the Vlan ID and enter 100 in the Vlan ID field.
Under IPv4 Settings, pull down the Connection menu and select PPPoE.
Then enter the PPPoE credentials you were given. in their respective fields.
And then scroll to the top and click the Save button.