To edit product SKU, price, weight and stock quantity:

1. Go to Product.
2. Click on the product that you wish to edit on the left bar to view the product item.
3. Click Edit then Product Item under View Product Item to edit fields like Product Item Name, Category, Keywords, Custom Meta description, Product Type, Short Description, Long Description, Manufacturer, Theme.
4. Click Save.
5. Click Options then Manage Products under View Product Item to edit SKU, Price, Weight, Stock Quantity and etc.