•  To create a request for certificate open the server name
•  From action menu click create certificate request or create domain certificate
•  Under this section provide common name ,organization etc. & click ok, under cryptography service provider specify file name and bit length
•  Once you create request open the file copy the PEM content.
•  Open the iis server
•  Go to the location where you want to save SSL certificate.
•  Open notepad and name it and paste the PEM content as.cer file extension and save type ’all files’. Then we can see our certificate.
•   Noe select your server, go to server certificate then complete certificate request.
•  Browse file name containing SSL certificate and chose SSL certificate file Name then give it a friendly name and click ok. Now you have server certificate.
• You can click on site & choose bindings in right side menu.
•  Click add, under type select https & give your host name , under SSL certificate select your certificate click ok and close.
•  Go to your website name & then restart on right hand side and click on it. Now our site should have certificate present on https.

url:- https://www.youtube.com/watch?v=nB3TFDkDkcU

https://www.youtube.com/watch?v=WjtSsRjia5g