If you do not know how to change DNS Server on Windows, Mac and Android computers, please refer to the steps below. I will guide you step by step for you to apply right on your device.
Change DNS on Windows computers
Step 1: Go to the Start Menu and type in the search box “Network and Sharing Center” and press Enter.
Step 2: A window will appear and here you will probably see a lot of current connections if you have a virtual machine installed, etc.

Step 3: Click on the link Change adapter settings on the left.
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Step 4: Right-click the Connection you are using → Properties → Internet Version Protocol (TCP/IPv4) → Properties.
Step 5: Tick the box “Use the following DNS server”. Fill in 2 DNS Server addresses and click OK to save.

Change DNS on MAC computer
Step 1: Launch Spotlight by pressing Cmd + Space and typing in Network.
Step 2: There will be a blue dot next to the connections you are using. Click “Advanced Settings” and select “DNS” in the Connection Properties and press the + sign.

Step 3: Fill in the DNS Server that you need to change. Then click OK to save the settings.
How to change DNS on Android
Step 1: Open the Wifi management menu on your device.
Step 2: Touch and hold the Wifi network you are connecting to and select “Modify Network”.
Step 3: Tick the box “Show hidden options” then select “Static IP Address”.

Step 4: Enter the DNS Server address in the DNS1 and DNS2 input boxes. Finally, tap the OK button to save.
So you can see that changing DNS on devices is quite simple, isn’t it. This way you can access some blocked websites as well as resolve domains faster for optimal surfing speed.
Good luck!