You should be able to "archive" directly from your nook. I don't know what model you have (I have 2 and you access them differently). If you can't find it on the nook you can do it from your library on the computer at
http://www.barnesandnoble.com , sign in and go to "my nook", then "manage library". You can either "archive" which greys it out on your nook, or delete it if you never want to see it again. Archiving will help you not buy the same book twice, but will also take up space on your nook. So far I haven't had to delete anything and I've had mine over 2 years. Good luck & Merry Christmas!!!