In general to start using CDN you have to first create a CDN service then add a CDN CNAME record to your DNS configuration and then change URLs of your static content to point to the CDN CNAME.
Let's say that in your website source code you have
<img src="http://www.mycompany.com/public/img/logo.png" />
and let's say that you have already created CDN service with Service Domain static.mycompany.com.
To start serving your company logo from CDN you have to change the src attribute of the img [...]
