First of all, you're showing me two different pages, one is a zen cart category page, and one is your home page. Your home page has the "new products" and "monthly specials", and those home page boxes are
not designed to have an add to cart button.
Now, if you go to a category page on your site, yours should show a "Buy Now" button as well, unless your product has attributes that the customer needs to choose, then it will have a "more info" link instead.
Here is an example of a category page on your site:
http://www.electronic-web.com/games/...ex&cPath=10_22
If you had the "login for price" function turned off, you'd probably have the "add to cart" buttons as well, if not, go to "configuration", "product listing" and turn the add to cart button on.