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Install automatically in WordPress on the Plugins -> Add New subpanel or upload the delete-me folder to the /wp-content/plugins/ directory.

Activate the plugin on the Plugins panel in WordPress.

Go to the Settings -> Delete Me subpanel. Select the WordPress roles you want to allow to delete themselves using Delete Me and save changes.

The delete link will be placed automatically on the Users -> Your Profile subpanel for roles you allow, but if you have a Post or Page you'd like the delete link to appear on just copy and paste the Shortcode [plugin_delete_me /] there. A custom PHP template can use the Shortcode like so <?php echo do_shortcode( '[plugin_delete_me /]' ); ?>