See below for automating the successive renewals of a certificate. 

As explained in Creating a certificate, you can configure certificate renewal when creating the certificate.

To automate the renewal of a certificate

  1. Log in as an administrator with the required permissions. 

    See Browsing roles for the permissions granted to each ad administrator role.

  2. Go to Control > Certificates.
  3. In the main grid, click Select Action > Automate for the certificate.
  4. Configure the following settings