In order to install an SSL certificate, you will first need to generate a CSR (Certificate Signing Request)
# Login to cPanel
# Click on Security >> SSL/TLS >> Certificate Signing Requests (CSR)
# Click on the link Generate, view, or delete SSL certificate signing requests.
# Enter details in Generate a New Certificate
Company Division :
# Click on Generate button to generate a CSR.
Once the CSR is generated, you need to provide it to the Certificate Authority like Comodo, RapidSSL etc and they will provide you the SSL certificate and CA bundle for browser compatibility.
Please check How To Install An SSL Certificate on cPanel
Please do contact us at esupport@L3webhosting.com if you require any further assistance.