On the new page click "Add New" next to "Free Shipping":

Basic Settings

General
- Status. Shipping option status — enabled/disabled.
- Test mode. Shipping Options in "Test mode" are displayed at checkout only if First Name field contains "Calcurates".
- Name. Add a name for your Free Shipping Option.
- Set different display name. You may use "Name" as an internal name, while set a different display name for checkout with this setting.
- Website. Pick the store's Website on which you want to display this Free Shipping option.
- Served Origins. Select Origin(s) which are served by this Free Shipping option. Learn more about Multi-Origin shipping rates.
Calculation
- Served Shipping Areas. Select Shipping Areas which are served by this Free Shipping option. Learn more about Shipping areas.
- Minimum order subtotal. Input the lowest cart subtotal required for Free Shipping to be offered at checkout.
- SKU exceptions. If required, input specific products that, if present in the cart, will prevent the Free Shipping option from being offered.
Advanced Settings
Info Messages
Show Description for Shipping Method
Add text which you'd like to display as a description to your Shipping Method. Use the following variables to display info in the shipping method's description: delivery date from - {delivery_from}, delivery date to - {delivery_to}, min transit days qty - {min_transit_days}, max transit days qty - {max_transit_days}, international taxes & duties - {tax_amount}, packaging results - {packages}. Twig-template is supported. - Magento. Check additional display settings in Magento admin (Calcurates extension settings)
Delivery Dates & Time info
- Select Delivery Dates. Add Estimated Delivery Dates for your Method. Choose from available Delivery Dates profiles.