Miele WCR 890 WPS Operating Instructions Manual page 23

 Remove the foil from the detergent
cartridge.
 Open the access panel for TwinDos.
Before using for the first time
 Push the UltraPhase 1 detergent
cartridge into compartment 1 until it
locks into position.
The following message will appear in
the display:

Now enter the settings for UltraPhase 2.
23