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Do you mean you want to add them to your BIR list? You can do that by going to the drop down menu under "My Account" and then to your 'Books I've Read" list. Once there, you can list a book by entering the ISBN and rating it by clicking on the stars under the title of the book.
Or, you can search for the book and just rate it by clicking on the stars. This will automatically add it to you BIR list.