Hi bishal,
It mean that if you want a "
well recognized" certificate you need to send to a Certificate Authority (Verisign, RSA, Equifax,...) your certificate request and they sign it (you pay for it).
If the WebServer is for intranet you don't need a "well recognized" certificate, you can confgure self-signed certificate. You can create it from IKEYMAN. Select Personal Certificates instead of Personal certificates request and click "Create self-signed certificate", then the steps are the same.
Tell us if you need more support.
Regards