We have a website with the page structure of

Heading
Custom text(default)
List of most download Products (Product addon cost in product pages)

I would like to add more customized text at the bottom of each page.
The plugin available at link below
http://www.zen-cart.com/downloads.php?do=file&id=1315

says, we can have customized content at Home page...

I would like to add content like this at every page to improve my website content.
For example, even at product page, I want to insert product specifications and benefits after the product price / product add on price.

Is there a similar module for that ... if yes how to use that .
Thanks in advance guys