Did you purchase one? I bought mine through GoDaddy and its in the products list. You tell it which domain you want to attach it to. One only thing I couldn't figure out fully was forcing HTTPS from HTTP but it didn't care too much since I can direct it when needed with hyperlinks.
www.jdtechservices.com forwards to my proper HTTPS page.
The instructions for installing a GoDaddy certificate should be found at your blogger.com account. They will have to issue/receive the security information for the GoDaddy certificate. Its a very specific set of instructions, usually dependent upon the hosting providers requirement AND access to the server level required for the installation.
Hope this helps,