As always, prior to making any changes to your site, we do recommend that you perform a complete backup your site before proceeding.
Install a WordPress Plugin Automatically through WordPress
Go to your WordPress admin panel.
Go to Plugins > Add New.
Under Search, type in the name of the WordPress plugin or descriptive keyword, author or tag in the search form; or click a tag link below the search form.
Find the WordPress plugin you wish to install.
Click Details for more information about the plugin and instructions you may wish to print or save to help set up the plugin.
Click Install Now to install the plugin. A popup window will ask you to confirm your wish to install the plugin.
If this is the first time you've installed a WordPress plugin, you may need to enter the FTP login credential information. If you've installed a plugin before, the login information will already be stored.
Click Proceed to continue with the installation. The resulting installation screen will list the installation as successful or note any problems during the install.
If successful, click Activate Plugin to activate it; or Return to Plugin Installer for further actions.
Note: Some WordPress plugins require further steps for customization. The Detailsreadme file should contain step-by-step instructions. After installation, this information is available on the plugins panel for each plugin.