You'll first need to have delivery zones created.
You can access and edit your delivery zones here.
In the Details, you'll find text fields where you can enter values for Order Minimum, Delivery Fee, and Delivery Fee Description.
Click "Save" to apply these settings.
The Delivery Fee Description is how the fee will be displayed in the cart of your E-commerce menu.
Note: These minimums and fees are unique for each independent Delivery Zone.