CA (Certificate Authority) does not allow certificates to be renewed in the same way as domain registries allow with their domain names. Certificate have no grace period, no redemption period.
RCP offers auto-renew option.
In the SSL overview of your control panel you can find the option "Auto Renew" (AR)
If you enable option, we will automatically create a new SSL order for you with the same details as the old certificate, including the order period before 15 days of expiration date.
We will place the SSL order, but the validation which is performed by the CA, is still a necessary step before the certificate will be delivered.
Please be aware that you will receive a new certificate, which still needs to be installed with the "old" private key.
AR = Auto Renew
RN = Renew
RI = Reissue
CN = Cancel
If you do not want to use the auto renew settings, you can always start a new order in your control panel and let the old SSL expire.
If you start the order within the last 90 days of the old SSL being active, the remaining period of the SSL certificate will be added to the new certificate.