This article covers additional adjustments to the Free Shipping section of the Shipping tab of the Settings app after you've completed your initial configuration.
To offer free shipping in any capacity, make sure the Active toggle is on.
You can offer free shipping on all orders by selecting the Free shipping on all orders check box (if you do, you can't offer price-based or weight-based rates). Enter a Delivery Estimate value to display the number of days a customer can expect to wait to receive the shipment.
If you only want to offer free shipping on orders that cost a certain amount, make sure Free shipping on all orders is deselected and enter the price value of your choice in the Free shipping on orders over field.
When you're finished, press Save.
For information about different kinds of shipping rates, see the following articles: