After generating CSR i.e. Certificate Signing Request you will need to use it for requesting SSL certificate activation for your website.
A CSR or Certificate Signing request is a block of encrypted text generated on the server that the SSL certificate will be used on. It contains all important information to be included in your SSL certificate, information comprises of your common name (i.e. domain name), locality and country etc.
cPanel provides you a built-in feature to generate CSR code to use for sending certificate signing request and get your SSL configuration settings ready to work on your website’s domain.