To renew an expired certificate:
Click Renew SSL next to the certificate status.
Edit your SSL certificate details: your certificate name (optional), body, private key, and certificate chain. You may change all or some of these fields. When you are done, click Next.
Set up the domain: your current domains can not be edited, only removed, or you can add new domains and edit the JPDs associated with your domains. When you are satisfied, click Done.
Note
Make sure the new SSL covers the defined domains under the existing SSL, or delete the redundant domains.