1) Click on "Manage Inventory" under the 'Inventory' heading of the Control Panel.
2) Search for your item by it's Item ID or Author / Title.
3) Scroll down to the 'Search Results' and click the 'Edit' link under your item.
4) Click on the 'Amazon Properties' button.
5) Scroll down to 'Use Auto Notes' under the 'Listing' heading and Uncheck 'Use Auto Notes'.
6) A text box will open next to 'Notes'. Edit your listings Amazon notes.
7) Scroll down and click the 'Save Properties' button to finalize.