To get access to your OneNote files via iTunes, please compress them in ZIP format first. Then open iTunes, click on your iDevice name, go to the Apps tab and use the file sharing feature to upload your .zip files. Choose “MobileNoter” in the list and press “Add…” to select your notebooks.
Then open iTunes sync list on your iDevice
and select what you want to sync.
After notebooks to sync are checked, press Done, then perform the synchronization and your notebooks will appear on the MobileNoter Home screen. If there are many notebooks and you do not see all of them on the screen, you may scroll the list to the right and left.