first time login your cpanel then select your SSL/TLS option
SSL/TLS
The SSL/TLS Manager will allow you to generate SSL certificates, certificate signing requests, and private keys. These are all parts of using SSL to secure your website. SSL allows you to secure pages on your site so that information such as logins, credit card numbers, etc are sent encrypted instead of plain text. It is important to secure your site’s login areas, shopping areas, and other pages where sensitive information could be sent over the web.
click manage option
Manage SSL Hosts
This interface lets you configure SSL for your domains.
An SSL certificate can secure one or more domains; to create an SSL host for a domain, you must have a certificate that secures that domain. Each SSL certificate has a matching key file that must also be present to install the certificate. SSL certificates for production use usually also require a CA bundle, which this page will automatically try to obtain from the server; in the event that the server cannot find the required CA bundle, you will need to paste it here.
Certificate: (CRT)
The certificate may already be on your server. You can either paste the certificate here or try to retrieve it for your domain.
