DNS server is to translate this human-readable web address (like kcyeap.net) into a computer-readable number also known as an IP address (220.127.116.11).
So What is OpenDNS?
OpenDNS is a DNS (Domain Name System) resolution service. OpenDNS extends DNS adding features such as as misspelling correction, phishing protection, and optional content filtering. It provides a ad-supported service “showing relevant ads when we [show] search results” and a paid advertisement-free service.
How to configure it?can refer here
Just remember, 18.104.22.168 and 22.214.171.124 is the openDNS
For those who hate your ISP DNS ( as usually it suck) , you can use the OpenDNS, it free anyways 🙂