Before you take any steps please back up your files and database. The plugin works only with default CMS pattern. If you manually changed CMS patterns, the plugin might not help you.
Login to Webasyst administration area.
On the top bar find Site.
In the CDN field write your CNAME from the G-Core CDN control panel. Ensure that your CNAME record has been configured in a proper way before using it for integration
Integration has been completed! We highly recommend you to check the HTML code of your web page to ensure that URLs have been rewritten properly from your original ones to CNAME from the control panel.
To do that press F12 or open Developers Tools in your browser, choose the Network tab and refresh the page. All static files should have your CNAME in URLs.