There you can simply install the SSL to our cPanels without more hard things. It is of course one click. Login to cPanel and visit "SSL / TLS Status".
After that Click "RUN" button. Then within a few seconds, SSL / HTTPS will install to your website. After that, you may need to Redirect to HTTPS by cPanel.
Before doing that, make sure to point the domain name by nameservers. Otherwise, SSL will not be installed.