Hi,
In the order object, you'll find the order_shipping_id attribute which contains the id of the shipping method selected during the checkout. So you can compare it with the id of the shipping methods for which you want the message in order to display it.
For the emails, you can do that via the menu System>Emails.
For the checkout end page, you can use the "Display view files" setting of the HikaShop configuration in order to know which view to edit:
www.hikashop.com/support/documentation/1...-display.html#layout