Warning: You'll need to sign out of your account at the end of this to make the change, so make sure you have saved all of your work before you get started.
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Select Start , select Settings > Accounts > Your info.
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Select Sign in with a local account instead.
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Type the user name, password, and password hint for your new account. The user name must be different than any others on the device.
Note: If you’re using Windows 10, version 1803, you can add security questions—instead of a hint—to your local account to help you reset your password in case you forget it. Check your version of Windows 10
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Select Next, then select Sign out and finish. Sign back in with your new local account.
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If you didn’t add security questions to help you reset your password, it’s a good idea to create a password reset disk. If you don't do this and then forget your password, you won't be able to recover it.