I came across a related thread here but I still am not sure exactly where to put in my custom DNS servers e.g. ones provided by NextDNS.io.
I have entered the following here
but I still see this
You may be able to get some assistance with this from our Tech Support team. They're available anytime at 1-888-811-2323 or via Live Chat online over at www.telus.com/assist
Unfortunately, the Tech Support team were out of their depth for a question like this
I'd like you to consider how much time it would take me to explain this issue to Tech Support. All the information is here already.