Does anyone know how to set up CF 1.1.1.1 DNS to ZTE F660

Does anyone know how to set up CF 1.1.1.1 DNS to ZTE F660 router?

Usually, after you have successfully logged into your Router interface, there should be some input fields or a menu for LAN → DHCP Server → DNS Server1 IP Address put 1.1.1.1 and DNS Server2 IP Address put 1.0.0.1 and Save.

If not sure, just configure 1.1.1.1 and 1.0.0.1 at your device (desktop PC):

… or use Cloudflare WARP app:

Maybe this could help a bit:

Thank you so much for your reply but i did all those things but DNS resolver not working properly
Checked with Cloudflare ESNI Checker | Cloudflare

Can you post what you get for the results by visiting the URL https://1.1.1.1/help?

From your screenshot from above, under the Connectivity to Resolver IP address is good - 1.1.1.1 and 1.0.0.1.

Can you run the CMD and type nslookup cloudflare.com?
Should return something like below, if you configured custom DNS servers in the router or at least for your network connection adapter (following my previous post where is the link how to setup Cloudflare DNS servers) in the Windows 7 Start → Control Panel → Network Connection & Sharing Center → Network adapter → Options → IPv4 → custom DNS servers:

Server:  one.one.one.one
Address:  1.1.1.1

Non-authoritative answer:
Name:    cloudflare.com
Addresses:  2606:4700::6810:84e5
          2606:4700::6810:85e5
          104.16.133.229
          104.16.132.229

Due to Mozilla FireFox usage and Trusted Recursive Resolver, this article could be a bit of help:

Furthermore, due to the DNS over HTTPS, you can do it on by following the instructions from here: https://developers.cloudflare.com/1.1.1.1/dns-over-https/web-browser.

Do not forget to restart (close and re-open) your Web browser upon the changes.

Maybe even you could try to restart your computer, just in case.

Re-check again on the https://1.1.1.1/help, even try to hit refresh (F5) just in case.

this is what i get

C:\Users\Sameera>nslookup cloudflare.com
Server: UnKnown
Address: fe80::1

Non-authoritative answer:
Name: cloudflare.com
Addresses: 2606:4700::6810:85e5
2606:4700::6810:84e5
104.16.132.229
104.16.133.229

any idea about this 2 pages
https://setuprouter.com/router/zte/f660/v5-play-media/ipv6-83968.webp