Flat fee

As your shipping is set to a flat fee. You can edit the flat fee price by following the link below.
https://peppercafe.com.au/wp-admin/admin.php?page=wc-settings&tab=shipping&zone_id=2

Free Shipping

Your free shipping is based on specific postcodes and coupon.

You can edit the postcode here:
https://peppercafe.com.au/wp-admin/admin.php?page=wc-settings&tab=shipping&zone_id=1

You can edit your coupon here:
https://peppercafe.com.au/wp-admin/edit.php?post_type=shop_coupon