To create SSL Certificate, you need to generate Certificate Signing Request (CSR) on your server and send it to a Certificate Authority. This video shows how to generate CSR on Windows Server 2019.
1. Open IIS Manger
* You can open Internet Information Services (IIS) Manager from the Server Manager>Tools
Or just type iis in the Start
2. Click on Server name
3. Under IIS, click Server Certificates.
4. In Server Certificates, click Create Certificate Request.
5. In Distinguished Name Properties, enter the info such as Command name, Organization, Organization unit, City/locality, State/province, Country/region.
6. In Cryptographic Service Provider Properties, select Bit length, 2048 in our example.
7. Save the CSR.txt file and send it to a Certificate Authority.
Please view this step by step video: