How to edit a Plugin in Easily Way?
The best way would be to just clone it and change the Plugin Name in the header and change the directory name. This way you could also have the original installed but not activated so you will still get alerts when updates are released.
Plugin Name: Name Of The Plugin
Plugin URI: http://URI_Of_Page_Describing_Plugin_and_Updates
Description: A brief description of the Plugin.
Version: The Plugin's Version Number, e.g.: 1.0
Author: Name Of The Plugin Author
Author URI: http://URI_Of_The_Plugin_Author
License: A "Slug" license name e.g. GPL2