Step 1: Download Joomla CDN Plugin
Download the latest version of the Joomla CDN plugin from Regular Labs.
Step 2: Install Joomla CDN Plugin
Log in to the Joomla Admin Panel and navigate to Extensions > Manage > Install.
Upload & install the plugin via Browse. Select the file downloaded in Step 1.
Step 3: Enable Joomla CDN & Set CDN URL
Navigate to Extensions > Plugins. Click System - Regular Labs - CDN for Joomla!.
Select the Setup tab and insert the CDN URL obtained from the CNAME record generated when you created a CDN resource page into the CDN Domain field. Finally, hit the Save button. Refer to How To Set Up A CDN Resource guide if you are unsure about your CNAME record.
Your website assets are now served from CDN.
You can verify if your Joomla website is on CDN by viewing the HTML source code. Image sources shall be replaced with CDN URLs.