To connect your Etsy store to ShipStation, simply follow the steps below.
Head to your Account Settings (the wrench icon in the upper right).
Next, select Selling Channels and then Store Setup from the sidebar on the left.
Then, click on the Connect a Store or Marketplace button.
Scroll and browse for Etsy, or use the search bar and click the logo. Here, just enter in your Etsy username and click Find My Shops.
If you need to find your Etsy username, head to your Etsy account, find the You tab, click that and head to the View Profile page.
Your username will be in the URL for the View Profile page.
It will look located at https://www.etsy.com/people/USERNAME?ref=hdr_user_menu
You'll now see your listed Shops. Here, select the store you wish to connect.
Click Connect and you'll be sent to log into your Etsy account. Login, then click Allow Access to authenticate ShipStation's connection to your Etsy account.
Finally, you'll be sent back to ShipStation and can set up your store settings within ShipStation. You'll need to enter in your company's name, phone #, e-mail, website, and logo, in addition to choosing which e-mail templates and/or packing slips to use for the store. Finally, you'll choose how you want your products to be imported (by Name or by SKU). If you don't know all of this information, you can always go back and change the information after you set up your initial connection.