Install the Certificate in cPanel
After you’ve completed the SSL order process and have been sent the Certificate by your Certificate Authority of choice, click on the Generate, view, upload or delete SSL certificates.
On the SSL Certificates page, paste the certificate into the provided box which should then list your certificate details. Click the Save Certificates button to save the certificate ready to use.
You can now return to the SSL/TLS page by clicking the Return to SSL Manager option at the bottom of the page. You can now follow the file article on selecting the SSL certificate here