To change your Apple Watch passcode, use the Watch app on your iPhone. Here's how:
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Open the Watch app on your iPhone.
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Go to the My Watch tab located at the bottom of the screen.
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Scroll down until you find the "Passcode" option and tap it.
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Select "Change Passcode." You'll be prompted to enter your current passcode and then enter a new one.
That's it! Your Apple Watch password has now been changed.