In most cases, changes you make to product information appear on Amazon within 5 minutes.
However, some updates can take up to 6 hours. Product descriptions longer than 500
characters are generally updated at 8:00 AM PST the following day. Images may take up to 24
hours to appear on a product detail page.
To edit details for an existing listing:
On the Inventory menu, select Manage
Select the Active status filter above the product list.
Find the listing you want to edit, and select Edit from the
drop-down menu for that listing.
Click the links at the top of the page to add, edit, or change the listing's content.
You can also type price and quantity updates in the text boxes in the
Price and Quantity columns.
Click Save and finish.