Astrill Setup Manual:How to configure DNS on network adapter on Windows 7
Open Control Panel and click Network and Internet.
Click Network and Sharing Center.
Click Change Adapter Settings.
Right click on Local Area Connection.
Select Internet Protocol Version 4 (TCP / IPv4) and click Properties.
Tick Use the following DNS server address. Type in 188.8.131.52 and 184.108.40.206 just like on the screen below.
Right-click on same network adapter and select Status.
Click on Details...
Under network connection details, you will see 220.127.116.11 and 18.104.22.168 as DNS servers. This is a confirmation that DNS has been set.
Click on Close button, then click on Close button again.