If you are using Internet Explorer to view your OneNote page, you should see "OPEN IN ONENOTE" near the top next to FILE, HOME, INSERT, VIEW. Once you have the notebook open in OneNote, the search field is in the upper right corner and can be used to search the ENTIRE notebook.
If you are using Internet Explorer to view your OneNote page, you should see "OPEN IN ONENOTE" near the top next to FILE, HOME, INSERT, VIEW. Once you have the notebook open in OneNote, the search field is in the upper right corner and can be used to search the ENTIRE notebook.