To manage the products,

1. Go to the Magento Admin Panel.
2. On the left navigation bar, click on Zalando Retail Integration.
   The menu appears as shown below:
   
3. Click on Manage Products.
   The Manage Products Page appears as shown below:
   
4. All the created products will be listed in the grid.
5. Now to upload and validate the products in bulk, select the products and then click on the Actions list.
   
6. Click on Validate and Upload the Product(s).
   The selected products will be validated and uploaded.