The way DNS Changer works couldn't be simpler: you choose the DNS you want to browse from and hit the "Start" button. When the app is green, your connection will have changed and you'll be using the chosen DNS. Among the default choices, you'll find various well-known DNS options: Google DNS, Open DNS, Yandex DNS, Level3 DNS, etc.
Another one of the possibilities you have when it comes to changing your DNS is to choose a custom DNS. You just have to fill in the two fields and you can use the DNS you've provided.
DNS Changer is a super useful tool that lets you browse the internet more freely. It's compatible with WiFi, 2G, 3G, and 4G networks, and lets you get around blocks and restrictions.