The Gardena Water Computer with EAN 04078500052863 is the Bluetooth model. It is not compatible with the Gardena Smart System (Smart Gateway, Smart Sensor, water distribution control).
Install Gardena App on your mobile device. The go close to you irrigation Device and then you can install it with the ( + ) on the App. Very easy and works perfect. Tray to do it, it should work.
The desired type of these watering times could be managed exclusively with the Smart Sensor Control Set from Gardena:
Gardena Smart Sensor Control Set (Watering Set)
However, this set incl. Smart Sensor is already sold out and will probably not be available again until next spring 2022.