SSL Certificates are generated automatically, but if you have problems and your website does not use https, the way to install is the following. 

How to install SSL in CyberPanel?

1. CyberPanel Home; Websites>LIST WEBSITES: Issue SSL

If for some reason you see an error, the following way is

2. CyberPanel Sidebar; SSL>MANAGE SSL> Select Website : Issue SSL

Install SSL for subdomains and child domains

1. CyberPanel Sidebar: List Sub/Addon Domains> LIST CHILD DOMAINS: Issue SSL
2. HOME: Websites>LIST WEBSITES>Manage>DOMAINS: List Domains >SSL [Issue]