In the cambio-App, just navigate to „Buchung über Kartenansicht“. All available smumos are automatically shown on the map with a red 'S' icon.
Choose a car and book it directly. The smumo will be reserved for you for 20 minutes. After that, your reservation will expire.
Please note: Once you have removed the key from the smumo car, you must start the car within 10 minutes. Otherwise your booking will automatically expire.