Clicking on the Products menu at the left menu bar or Manage Products in the middle of the dashboard page take you to the products page showing all active products from your Shopify store.
The products page looks like the below screenshot.
Below are the list of features you can use here.
Update Profile: Click on the Update profile button in front of any product to assign a Etsy configuration profile.
It will open a popup with the option to choose from the list of available profile.
Choose a profile from drop down and click on the Submit/Update button.
Search: You can filter the list of products.
Push To Etsy: Tick the checkbox in front of all products you want to push to your Etsy account and click on Push To Etsy button.
Please note that when you publish some products, they will gets added in App's queue and will take some time to process and appear on your Etsy seller account.