Go to Settings
Click on Advanced
Click on Code Injection
Copy the block code and place it into the HEADER box show below
Our servers respond in 100 to 300 milliseconds so if the script is the first to process in your page, then the block will be almost instantaneous.
The block script is an asynchronous non blocking script, hence it will process while the rest of your web page loads. This will prevent any increase in page loading time for visitors who don't end up getting blocked.