Simultaneously press and hold Temp. and Delay End for 3 seconds until Cb appears on the display.
On some models, you do this while the washer is already on. On other models, you start with the washer off, hold the two buttons, and then touch Power to turn on the washer while holding the buttons.
Either way, if you're successful, Cb appears on the display and you can let go.
Temp. and Delay End is the most common button combination, but if that doesn't work or you don't have those buttons, check your user manual for instructions specific to your model. If your user manual does not cover Calibration Mode, then your model doesn't have it.