Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Can you delete books off of your Kindle

I received a new Kindle for Christmas. I love it so far - especially the sample feature where you can read the first few chapters of a book to be sure you enjoy the writing of the author. That is real important to me. But I can't figure out and cannot find it anywhere - how do you delete the sample books from the screen. Does anyone know whether you can delete or not.