Download Gem for OneNote Add-in from:
http://www.onenotegem.com/gem-for-onenote.html
Extract .exe installer from .zip file, and run .exe like install normal software.
Run OneNote, New Gem Tabs Appear
After installed add-in, run OneNote, you will find the new Gem tabs appear in OneNote ribbon.
If you have any issue when you are installing Gem, please contact our staff for support. Support