If you're looking to connect your private label product to an existing listing in your store, first do that before you change supplier. You can learn that from here.

To change the supplier of the product, go to its Connections tab in Dropified. 

Here you can click Add Supplier and paste in the URL, then click Save Changes:

The new private label product will then be set as the new supplier and you'll be able to place orders. 

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