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.
1.You need to buy the plugin (unfortunately, there is no free plugins at the moment). You can buy it here. Instal the plugin.
2. Login to CMS administration panel and go the the Add-ons sections, Manage Add-ons.
3. Click on +.
4. Choose the way to instal the file . Click Unpload and instal.
5. Having installed Universal CDN Add-on, go to its settings.
7. Apply settings and enable the plugin.
Integration has been completed! We highly recommend you to check the HTML code of your webpage 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.