In order to upgrade an SSL certificate, you have to cancel the old one and then order a new one.
To cancel your existing SSl certificate login to your Customer Area -> Billing -> Cancel Services tab and click on the Cancel button next to the SSL you want to stop using. Then, simply follow the instructions and in a minute your existing SSL certificate will be canceled
Once you do that, you can order a new SSL from our Order page. On it, select SSL and chose the new type of certificate you want to use. Next, follow the instructions on your screen to finish the SSL purchase
Bear in mind that private SSLs are non-refundable according to our Terms of Use.