"How can i edit PHP short code directly on word press instead of reinstalling plugin?"
Don't edit the plugin files directly - they get overwritten when the plugin updates ! OR if it's your plugin, u trying to code a shortcode for what ? Do u have any builder ?
Instead, add your custom shortcode to your theme's child, not the main, same as the plugin it will be overwritten ! functions.php file:
Go to Appearance > Theme Editor
Open functions.php
or use WP File Manager plugin
Do u meant being helped on that ?