How to change DNS settings using Control Panel (MAC OS)
1. From the Apple menu, select System Preferences. The window shown below appears.
2. Select Network. The window shown below appears.
Select a network interface from the sidebar. By default, your primary network interface is selected. If you use more than one interface to connect to the Internet, use these instructions to update the DNS servers for all of the interfaces.
Click the DNS tab. The window shown below appears.
6. Click the + button to add a new DNS server.
7. Please enter 18.104.22.168 (Google DNS) and DNS address of your Internet Service Provider (ISP).