How Do I Restore the Send To OneNote Widget?
"When I first started using OneNote 2013, I turned off the Send to OneNote tool after it appeared. Now, I'd like to use the Send to OneNote tool. How do I turn it back on?"
To restore the Send to OneNote tool in OneNote for Windows go to the View tab of the ribbon and click the "Send to OneNote Tool" button.
If you want it to start automatically every time you start OneNote (I don't, by the way) check the "Start with OneNote checkbox" on the tool.