When your requirement is straightforward with the same shipping charge, you can create a default shipping price that will be applied always. And, if you want to give your users to pick their shipping charge, say, for example via PriorityMail, DHL, FedEx etc., you need to create selectable shipping charges.
1. To set up the default shipping charge go to "Admin > Settings > Shipping Costs". Under the "General" tab, set the default price. It will be applied when no selectable shipment prices or shipment rule is set to override.
If you requirement is simple as having a single shipment price, press on "Save" to complete the setup. If you need to work with multiple shipment price options that users will choose, move on to the next step.
Selectable shipping costs
1. Click on the "Add" button under "Selectable shipment costs" to add new shipment cost. Enter the required information such as price, title and identifier.
2. Repeat this step to add multiple shipping costs possibilities. In our case we are adding a standard delivery for 7.50 CHF: