how to deal with duplicate content

I build my store with Hikashop (It is a great component, thanks guys.) I scanned my website with seomoz.org to find the my SEO errors. I found 1081 errors!!! about 1000 of them is about duplicate page content. For instance 21 of them is the add to cart component which you can find here:http://pearlsbyaj.com/component/hikashop/checkout/notice/cart_type-wishlist/tmpl-component.html this content has 21 types of URLS base on seomoz.org!!!
This is the same situation for other components and products.
How can I remove these URls, add Canonical URL or something like that to get a good SEO!

Also how can I add no index rel to some categories because I do have couple of products that belong to multiple categories if I want to do the Canonical URL to each of them I think it is not the right way and also waste of my time. I prefer to add no index to subcategories

Hi,

It is actually important to let the search engines follow the links to your products if you want a good SEO. So I would recommend to enter a canonical URL for your products and that will avoid the duplicate content SEO errors.
Nevertheless, if you want to add a no index rel to your categories or products links, you need to edit the files listing_img_title (or the view layout corresponding to your item box layout options) of the views "categories/products via the menu Display->Views and change the a html tag of the links to include that no index rel attribute.