[1] There are four stages to set up SSL on your Microsoft IIS 5x web server:
Create a Certificate Signing Request (CSR)
A CSR is a file containing your certificate application information, including your Public Key. Generate your CSR and then copy and paste the CSR file into the web form in the enrolment process:
Generate keys and Certificate Signing Request:
Links:
[1] https://www.digi-sign.com/downloads/download.php?id=aacd-digi-ssl-pdf
[2] https://www.digi-sign.com/support/digi-ssl/generate+csr