How to modify your DNS on mac OSX Yosemite and El Capitan
1. Go to System Preferences

2. Click on Network

3. Select the first connection in your list and click Advanced

4. Select the DNS tab and add 208.67.222.222 and 208.67.220.220 to the list of DNS servers. Click OK

5. Cache Flushing
At the point, we highly suggest that you flush your DNS resolver cache and web browser caches to ensure that your new DNS configuration settings take immediate effect.

2. Click on Network

3. Select the first connection in your list and click Advanced

4. Select the DNS tab and add 208.67.222.222 and 208.67.220.220 to the list of DNS servers. Click OK

5. Cache Flushing
At the point, we highly suggest that you flush your DNS resolver cache and web browser caches to ensure that your new DNS configuration settings take immediate effect.