First, you need to be logged in to your WordPress Admin Account by entering the admin url that has been provided when you installed the WordPress. For example, www.example.com/wordpress/wp-login.php.
Once logged in, it will redirect you to the admin page of your WordPress site. Hover your mouse to the “Plugins” button and click on “Add New”.
Then the Add Plugins screen will show up, giving you the option to search for the plugin you wish to install. For this article, we will install “Wordfence Security” (A WordPress Firewall and Malware Scanner).
Once the plugin is shown on the results, you can proceed by clicking on “Install Now” button. You will see the plugin is installing as shown on the image. After it has been installed, you will be given the option to activate the newly installed plugin. Just click on “Activate” for the plugin to start working within the WordPress installation.
After the installation, the plugin will show up on Plugin list when you click on Plugins from the left pane.