To edit one of your existing catalog items:

1. Sign in to your Yahoo! Store account.
2. Click on the "Catalog Manager" link in the "Edit" section of your Store Manager page.
3. Click on the "Manage Your Items" link.
4. Use the "View" pull-down menu to select the table that contains the item you would like to edit.
5. Click on the item's ID.
6. Edit your item information in the appropriate fields.
7. Click "Save" to save your changes.

Note: If you need to make edits to many items, you may want to use Catalog Manager's Upload Items feature, which allows you to make changes to your existing items or add new catalog items in bulk.