It's as easy as that. There'll be a button. Push it. And your pad will be deleted. Removed. Gone. With all its history. :')
On the command line, run npm install ep_push2delete.
Alternatively, browse to http://yourEtherpadliteInstan.ce/admin/plugins, search for ep_push2delete and click install.
After restarting the server, the plugin takes effect.
MIT