|You want to...||Do this...|
|Add SANs||Enter the common name you want to use, and then click Add.|
|Remove SANs||Click x next to the SAN, and then click OK.|
Adding SANs generates a new certificate that you must install on your server. Your old certificate only remains valid for 72 hours. After that, your websites using the old certificate will begin generating errors.
For installation instructions based on your server see Install SSL certificates.
For Exchange or IIS servers, you must generate a new CSR, and then use it to re-key your UCC certificate (more info). Finally, install the certificate as if it were new.
If you want to install the UCC on multiple servers, export the private key from the original server and import it on the additional servers you want to secure. Then, install the UCC on the new servers.
If you need further information regarding the replacement of an existing certificate or the import/export of a private key, contact the manufacturer of your hosting server software.