To connect your shop, go to menu and select My Stores > Connect Store.
You will be presented with a popup that looks like this
Select the type of store you have (ie: Shopify or Woocommerce) and then enter your store URL in the field provided.
This will then go to the respective ecom platform and ask you for authorization to connect your store to Sell The Trend. Approve the request. That's it! You are all done and ready to start importing products.