To manage products,

• Go to your Magento admin panel.
• On the top navigation bar, place the cursor on Linio.
  
• On clicking the Products Manager, you will be navigated to the page as shown below:
  

Now,

To validate single products,

• Click the validate sign for the product you want to validate, under Actions column which has been highlighted inside red box in the image below:
  
• Product gets validated and you may see the message on the top of the page.

To upload/update single products,

• Click the upload/update sign for the product you want to upload or update, under Actions column which has been highlighted inside red box in the image below:
  
• Product gets uploaded/updated and you may see the message on the top of the page.

To sync the status of the products,

• Click the sync product status sign for the product that you want to sync status for, under Actions column which has been highlighted inside red box in the image below:
  
• On doing so, the product status will be synced and the message will appear on the top of the page.

To edit a product,

• Click the edit sign for the product you want to edit, under Actions column which has been highlighted inside red box in the image below:
  
• On clicking it you will be navigated to the products page. There you can do the required edits in the product.