1. To checkout a courier, you have to be first on your operator account.
2. Press on the Courier tab from the left side of the page.
3. Then press on the List tab from below in order to see all couriers.
4. Then press on the Checkout button on the right of the wanted courier.
5. Once pressed, you can update the information that was initially entered and then save by pressing on the Update button.
6. After updating the information, the checkout button will disappear, but the value will be able to be modified in the edit section.