The Copyscape Premium plugin lets you check if a WordPress post is unique before it's published, by searching for duplicate content on the web.
You may download and install the Copyscape Premium plugin using the built-in WordPress plugin installer. If you wish to download the Copyscape Premium plugin manually, make sure to save it in the directory "/wp-content/plugins/copyscape-premium/".
Begin by activating the Copyscape Premium plugin in the "Plugins" admin panel using the "Activate" link. A simple installation wizard will guide you through the process of configuring the plugin.
To use the plugin, you must have a Copyscape Premium account with credits and an API key. If you don't yet have an account, please sign up and purchase some credits. To get your API key, please visit the API configuration page, click 'Enable API Access', and your API key will be displayed.