You may add (static) delivery options for your customer to choose from.
First, go to form edit mode, go to delivery.
Next, please enable 'Delivery Options' and make it as a requirement. Then you can see the list of Static Delivery Options. Please click 'Add Option'.
Type your option name and the price. And click 'Add'. Your option will be added into the list.
Now you can open your form and check-out the delivery options part.