Hello and Welcome,
To remove a book using Calibre, click on the icon for your reader at the top of the Calibre screen (just below the menu bar, in that mostly empty window), while the reader is plugged in. This will give you a list of book on your reader instead of your library in your computer. Just click on the book you want to remove and press the delete book button on the menu bar.
You can also delete books right from your Reader screen. I don't have mine in front of me, so if somebody hasn't posted directions by the time I get home tonight, I will update this message with exact instructions. It isn't too hard though, and you can probably find it yourself. I think it's part of the book menu.
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