After create the CDN resources (here) , the CDN resources now is ready to use.
If the website is WordPress,CDN Enabler (Plugin link) can be use.
1) Log into WordPress Admin portal
2) Go to Plugins and search for CDN Enabler , then install it
3) Then go to Plugins , click on the Settings under the CDN Enabler
4) Edit the CDN url to the CDN resources that created will do.