Reply To: function

I finished everything I miss only this I can not find the ” Button Invoice” to make it point when I click :

Now focuses on :
wp-content/plugins/easyreservations/lib/modules/invoice/editor.php?id=

I want that focuses on :
wp-content/plugins/easyreservations1/lib/modules/invoice/editor.php?id=

Can you help me so I finished ; )