Hi,
So first, he has a big "back" button on his browser allowing him to go back to the previous page. So adding one on your pages is not necessary. Users will be able to go back even if you don't add a second one.
Second, you have the possibility to enable the "breadcrumb" module of joomla via the Joomla modules manager in order to display a breadcrumb on your pages so that your customers can more easily navigate your website.
Finally, if you want a back button on the product details page, you can do like that:
www.hikashop.com/forum/2-general-talk-ab...on-product-page.html