The cPanel is accessed from the corresponding [order management] section (https://fornex.com/help/vh-order-management/#_2).

Installing the certificate

You can install either a purchased certificate from a third-party service or a free certificate from Let's Encrypt

Log in to the cPanel control panel

Go to "Security → SSL/TLS Manager ".

The SSL/TLS Manager allows you to generate SSL certificates, view them, download or delete SSL certificates.

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Then "Install and manage SSL for the site (HTTPS) "

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Then select the domain you want, enter the details and click "Install Certificate "

To install, you need a certificate, a key, a certificate chain (if any).

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To install it, you will need to click "Autofill Domain " and "Install Certificate ".

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Note! If you have enabled HTTPS, you may need to edit its content.

Errors related to mixed content occur when the main HTML content of a web page is loaded over a secure HTTPS connection and additional elements (images, videos, style sheets, scripts) are loaded over an unsecured HTTP protocol. This increases the vulnerability of the site and makes it less user-friendly.

You can read more about the topic here and here.

You also have the option to install a certificate when you add a domain through Billing.