This plugin is delivered with NopAdvance Core plugin on which this plugin is dependent. You need to install the plugin using the plugin installation guide provided here.
This plugin does not require any configuration once installed in the nopCommerce application.
Once the plugin have been installed, you will see the plugin menu under NopAdvance > Plugins > Deleted Products in your nopCommerce admin menu, similar as displayed in the below image.
Click on the List menu item from Deleted Products plugin menu as displayed above and you will be re-directed to the plugin list page.