One cannot ask verisign for a "Certificate Authority" certificate. The metaphor I use is, "it's like asking the government to print your own money".
Verisign itself is a CA, so asking them to give you a CA certificate is not likely. Asking them for a "web server" certificate is something they can accommodate.
Instead you will need to leverage your own Internal Microsoft (or other) CA to accomplish this, otherwise you will need to create a self-signed CA and roll it out to your clients:
If you are looking to import a certificate for the GUI, that is a different story, however the screenshot says "Import Certificate Authority".