How-to integrate CDN service on your Magento website.
PS: Before you make any changes we raccomend to you to make a full backup of your website.
Login the Magento Admin Panel.
Click on System and select Configuration on the navigation bar.
On the side menu click on Web and select the tab Unsecure.
Change the parameters with the configuration that you have received by email.
You can see a CNAME example on the image:
Click on Save Config.
Select Current Configuration Scope and on dropdown menu select Main Website.
Follow this Web > Unsecure > Base Skin URL deselect Use Default and modify the link with : cdn.yourmagento.com/skin/
The CDN is active on your Magento website NOW.
Once the static files are replicated to the CDN, browse your website and right click on the page. Select "Inspect" or "View Source".
If the configuration is successful, the URLs that looked like this:
will now look like this: