1. Log in to the server as the root user.
2. Run the following command:
/usr/local/cpanel/scripts/install_lets_encrypt_autossl_provider
3. Log in to WHM and navigate to the Manage AutoSSL interface (WHM >> Home >> SSL/TLS >> Manage AutoSSL).
4. In the Providers tab, select the Let’s Encrypt™ option. The interface will display the Terms of Service section.
5. Review Let’s Encrypt’s terms of service. If you agree, select the I agree to these terms of service option.
6. Click Save.