1. Navigate to the Shipping Settings page in Seller Central and click on the 'Self Ship' tab to edit the default 'Migrated Template'.
2. Under delivery speed options like 'Same-Day Delivery', enable the template for regions where orders can be delivered within the promised date by selecting the corresponding checkboxes.
3. Remove regions that cannot be delivered on time by clicking 'Delete' and save the changes by clicking 'OK' to update the guaranteed delivery settings in the template.