How to enable Nginx Cache for WordPress is not a tuff question or task anymore!
Login to your CloudStick Dashboard.
Select your server.
Click on Websites
Click on Website name for the one you wanted to activate Nginx Cache.
Enable the Toogle For Cache.
You can click on Cache Settings, to see advanced options for the Nginx Caching, such as the Memory Zone size, Maximum Cache Site, Cache purging time interval and exclude URLs and exclude cookies.