If you purchased an SSL certificate through you system administrator or ISP, then they should take care of the renewal procedures since they are trained for these tasks. Otherwise, if you have an account with SSL.com, you should log into your account that you created when you originally applied for your certificate.
FAQ: In what situations would I receive the following error message: “You are about to be redirected to a connection that is not secure. The information you are sending to the current site might be retransmitted to a nonsecure site. Do you wish to continue?”
This message indicates that you are leaving an encrypted session. From that point on, all data transmitted between the visitor and the website will be unencrypted.