After the purchase you will receive an email with the download link for the plugin ZIP file. To install the plugin go to the WordPress admin panel of your website, then go to Plugins and click Add New.
On the next page click the Upload Plugin button in the top left corner of the page.
Click the Choose File button, select the plugin ZIP that you downloaded and click the Install Now button.
Once the plugin has been uploaded and installed, click the Activate Plugin button.
After activation you will see a new menu item called Authors List in the main menu on the left.
That is where you will manage your authors lists. You can now proceed to the Adding an Authors List part of the documentation where you’ll add your first authors list.