how to add an article/script to product/chekout pg

I want to add and article/script/text etc... to my product page, above all my products also want to add an article/script/text at the top of the checkout page. how do i go about doing this??

thanks for your help in advance

? if it helps here is a link to the pages i want to add articles/text to at the top of the page.

www.kekaicoffee.com/index.php/products

www.kekaicoffee.com/index.php/products/checkout <---- cart has to have something in it to view.

For the product page, you have to edit the file "show" of the view "product".
For the checkout page, you have to edit the file "step" of the view "checkout".
Add your text right at the top of the file.
You can edit these files via the menu Display>Views.