How to install Enable Shortlink in editorial page & In Admin Toolbar for Pages & Custom Post Types plugin:
Go to Wordpress admin area and click "Plugins" and then "Add New" menu item.
In the right panel (left top) you will see "Upload Plugin" button. Click the button.
Next click the "Choose file" button in right panel (center).
Select zip file of the "Enable Shortlink in editorial page & In Admin Toolbar for Pages & Custom Post Types" plugin located on your hard drive and press "Open".
Click "Install Now" and the zip file will upload to your site.
Now click "Activate" button to activate the "Enable Shortlink in editorial page & In Admin Toolbar for Pages & Custom Post Types" plugin.
We've tested following plugins published by: Asaf Chertkoff