To list products on Etsy store.  Go to Sidebar Menu → List on Etsy. Then page will open as shown below    

    Click Single Listing ‘Select’ button. This will open a popup showing shopify products as shown below    

    After selecting the product click on ‘Add’ button. This will open product listing page  as shown below    

 Finally click on ‘List it now’ button to list product on Etsy