If you are not an administrator on the certification authority (CA) or if you use a public CA, after you have generated the certificate request, you need to access the public CA site to submit the request. Depending on the CA, the process varies, but you usually need to supply your organizational and contact information.
If you are prompted, choose the following options:
Microsoftas the server platform
IISas the version
Web Serveras the certificate usage type
PKCS7as the response format
After the public CA has verified your information, you receive an e-mail message that contains the text that is required for the certificate.