Step 1
Log into your Drupal site.
Step 2
In the Admin bar at the top, select Manage -> Extend
Step 3 (optional)
If your drupal instance do not have Update Manager by default, install it via Extend modules.
Step 4
After you've downloaded the CDN Module from Drupal.org, select "Install new module" and upload the .zip.
Step 5
Go back to Extend page, scroll down to Web Services section, checked CDN and CDN UI , clicked Install
Step 5
Hopefully, everything will install successfully. That's something your hosting provider can help with.
Step 6
Once the CDN Module has been successfully installed, from the top admin bar, go to Manage -> Configuration, scroll down to Web Services section, select the CDN Integration
Step 7
In the CDN Settings Page, Enable Serve files from CDN, and save
Step 8
In the Forever cacheable files, disable Make files cacheable forever ( if we enable this, this will lead to files failed to served on the initial setup
Step 9
In the Mapping, select Simple Mapping, serve all files , enter the CNAME record generated when you created a CDN resource into the from field, and save the Configuration. See How To Set Up A CDN Resource.
Step 10
Your done. Test the configuration and run a Pingdom speed test.