I don’t have a B&N Nook, but I’m told that these steps will allow you to sideload a .epub file into a Nook e-reader:
- Connect Adroid phone (or Nook e-reader) to PC.
- Open “NOOK” folder
- Open “My Documents”
- Drag the .epub file to the “My Documents” folder
- Disconnect the device
- Open “Nook” application on the smart phone or power on the Nook e-reader
- Filter by “My files”
- Your sideloaded book should appear