Downloading and Converting Free eBooks from Other Sites
If you find books at other sites, you must first download the book onto your computer. Keep track of where the book is stored on your computer, and check to see what format the book is in. You can tell this by the file extension. Nooks read EPUB, PDB and PDF format books, but another format is not necessarily a deal breaker
In order to read an eBook on your Nook or NookColor, the book must be in EPUB, PDB or PDF format. EPUB is preferred. Some sites supply books in other formats, and to read these books, you must first convert them. Calibre, a free program, will help you do this. Download Calibre and install it on your computer. Once you have opened Calibre, click on the red book icon at the left-hand side of the top bar. Navigate to the book you just downloaded, and upload it into Calibre.
Click on the yellow "Convert Books" symbol, change output mode to EPUB, and click "OK." Select the option to convert each book individually. The book will either convert to an EPUB format, or it will give you a message that the book is DRM-protected. If it is DRM-protected, you will not be able to legally remove the DRM. Amazon's Kindle uses DRM protection and cannot legally be loaded onto your Nook at this time.