I have set custom DNS for IPv4 and IPv6 in both WAN and WAN6. But they never work. I still cannot bypass ISP-blocked websites on all devices I own.

Every single search suggesting different ways to set up the DNS. So, what is the correct way to do this? Why is it so complicated, unlike regular router firmware where we could fill in a box and it will work right away?

I did this successfully a few years ago, but I cannot recall how I did it.

Thank you.