Assuming you have the 1.2 firmware version, scroll to the title on your home page and press the backspace button.
Or, if you are in the sample, scroll to the menu and one of the options when you click the wheel -- all the way at the bottom I think -- is 'delete this book' <may be worded slightly differently>. Click it.
In both cases it asks if you are sure. . .
If you want to read the book, be sure to remember the location number so that when you get the book you know where you left off.
Samples are NOT kept in your media library. . . gone for good. . .
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