How do I change the DNS settings for WAN on the TP Link VR600v? I am attempting to connect the router to my Telstra Internet provider (Telstra ADSL), but cannot get the router (or modem) to connect. It may be that I need to (manually) enter the specific DNS settings for my area, i.e.

South Australia, Northern Territory   
Primary:       61.9.226.33    Secondary:     61.9.194.49
 

When I click onto 'Advanced', then 'Network' (in http://192.168.1.1/) [as shown in instructions for another TP Link modem, here: https://www.tp-link.com/us/support/faq/1711/ ], WAN does not show in the drop down box. 

With thanks if anyone knows.