How to return or delete titles from the NOOK Color or Tablet
At this time, you cannot delete titles directly from the NOOK Color or Tablet. Don't worry, removing them using your computer is easy. Just follow the steps below.
Note: These instructions are for ADE 2.0. Please make sure you're using the most up-to-date version before continuing
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Connect your NOOK to your computer using the USB cable it came with.
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Launch Adobe Digital Editions (ADE) on your computer.
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Click on your NOOK, under 'Devices' in the library view.

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Right-click on the title you'd like to return or delete.

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Click Return Borrowed Item to return the eBook to your library and remove it from your computer.
Click Remove from Library to delete the book from your computer or device without returning it.
Note: If you delete the book without returning it, you'll still be able to download it from your library website until the lending period expires.