Introduction
Easily install an SSL certificate on your domain using AutoSSL.
Procedure
In order to install an SSL onto your domain, you may use the WHM utility "Manage AutoSSL" which installs domain-validated SSL certificates for the Apache®, Dovecot®, Exim, Web Disk, and cPanel Server services for users’ domains. Here you may issue a run against all the users on your server, or you may choose to have AutoSSL validate and issue certificates for the domains on a single users' account.
In order to issue a check against all the domains on the system simply select the blue "Run AutoSSL For All Users" button.
More on AutoSSL may be read here.