You can enable SSL support in Joomla simply by adding a few lines of code to your main .htaccess file, i.e. the one residing in the public_html directory of your hosting account. If you don't have an .htaccess file, you can simply create a new file with cPanel's File Manager.

You can open the .htaccess file with the File Manager in cPanel and add the following lines at the top of the file:

RewriteEngine on

RewriteCond %{SERVER_PORT} !^443$

RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [QSA,R=301,L]

<IfModule !mod_ssl.c>

Redirect permanent / https://www.yourdomainname.com

 </IfModule>

where www.yourdomainname.com should be replaced with your actual domain name. This will force every request to your website to go through SSL.