Editing the Successful Checkout Page:

1. Login to the Zen Cart Admin Panel.
2. In the menu, roll your mouse over the Tools option, then click Define Pages Editor.
   
3. Click the drop-down box labeled Select a file to edit ..., and click the define_checkout_success.php option.
   
   The text of the page will be editable. Update it as needed, you can use basic HTML in this box. 
   
   Click the save button below to record your changes.
   
   Now customers will see your updated page after making a purchase:
   
   
   Congratulations, now you know how to edit the successful checkout page in your Zen Cart powered eshop!