How do I run the Calibration mode before first use?

Power off, then power on the washer, and hold down Temp. and Delay End simultaneously for 3 seconds until the 'CB' message appears. Press Start/Pause to run the Calibration cycle; the drum will rotate clockwise and counter-clockwise for about 3 minutes. When complete, '0' appears on the display and the washer turns off automatically. Make sure the drum is empty before running Calibration. (Page 30)

From the official Samsung WW25FG5B34BEAC EcoBubble Front Load Washer manual, page 30

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