In order to complete the activation of your CDN service in WordPress, take the following steps.
1. Download the last version of CDN module for Drupal.
2. Extract Drupal’s module directory.
3. Follow the path: Configuration → CDN Integration.
4. In the Settings tab, enter the following:
→ Status: Enabled
→ Mode: Basic
→ Show statistics for the current page: Disabled
5. Save your settings.
6. In the Basic Mode tab: Enter the CDN Hostname in the field. E.g. cdn.testdomain.gr
7. Click on Submit.