Generate link to go to the edit page in the control panel of currently viewed page.
Unzip the folder, rename it to control_panel_edit_url and drop it inside into your _add-ons folder. Now, on any of your pages, you should be able to use {{ control_panel_edit_url }} in a link and away you'll go.
Maybe something like this in the footer of your site:
{{ if logged_in }}
<a href="{{ control_panel_edit_url }}">Edit This Page</a>
{{ endif }}
Requires v1.7