The shipping settings work closely with the local settings of your PrestaShop installation. While in PrestaShop 1.4 some of these settings were also found in the "Shipping" menu, in since version 1.5 all local settings have been moved in a new menu, named "Localization". This is where you will be able to edit geographical zones, countries, currencies, etc. Therefore, make sure to have a serious look at the "Localization" menu, which is explained in the next chapter of this guide, "Understanding Local Settings". For instance, in order to create a complete carrier in PrestaShop, you must have clearly defined your geographical zones before; this is done in the "Zones" page under the "Localization" menu.
The way carriers are created in PrestaShop was completed reworked in version 18.104.22.168, with a new : you now build new carriers using the Carrier Wizard.