To add one light/shutter into a system:
Step 1: select a room where you want insert a new object
Step 2: press "+" to add an object
Step 3: select kind of object (light/shutter/thermostat..)
Step 4: select type of object (On/Off Dimmer Colored...)
Step 5: Associate devices: add actuator/output and local comands if it's present
Step 6: Save it
After these steps an object association is done and saved.