If you are a cPanel web hosting user then at first you need to install the WordPress application from cpanel’s “Application” section. You can watch the video tutorial below.
After that you have to login to your WordPress website through wp-login.php page. (Example: https://www.blogrator.com/wp-login.php).
After successful login you will be redirected to the dashboard section of your website.
Then go to the plugin section > Add new plugin
In new plugin’s search bar type “Really Simple SSL” plugin. Then install and activate the plugin. This plugin has both free and paid option available. In the video tutorial I will guide you to install the SSL certificate manually for free.