You can modify information for products and listings either one at a time using the Manage Inventory tool in your seller account, or through an inventory file upload.
If you are not the only seller contributing information to a product detail page, you might find that some of your requested changes do not appear.
For more information, see How can I correct a mistake on a product detail page?
To edit product details or listing information one at a time, go to the Inventory link, click Manage Inventory and find the listing you want to edit. You can make quick changes using the boxes in the columns for Available (quantity) and Price. For other edits, click Edit on the far right or select Edit from the drop-down menu, and then enter the new information.
You can change more than one product at a time through an inventory file upload. Under the Inventory menu, choose Manage Inventory. Click the button Add a product and choose one of the options under List many products via bulk upload.