Help How access Dns settings on OTT 4xcpu 4xgpu tv box?


Hi All,
Greetings from a Newbie old timer.... I've just come over from the dark side (Apple TV) to Android with this OTT box. It's early days but so far seems a nice piece of kit.
However I'm B'd if I can figure how to access the DNS setup.
I want to set DNS of device to my proxyserver providers so it can pick up my IP for Geo locate and VPN.
I have looked in all network settings but no joy, I could only find one other post on similar box on this which told op to click on the highlighted wifi router, but this didn't do it for me.

So anyone with this box out there who can point me in right direction?