Press Ctrl + Alt + Delete
Select Change a password
Enter your current password
Enter your new password
Confirm the new password
Press Enter or click the arrow to save
Open Settings
Go to Accounts
Select Sign-in options
Choose Password
Click Change
Follow the prompts to set a new password
If you use a Microsoft account, go to account.microsoft.com
Sign in to your account
Select Security
Choose Change password
Follow the prompts to update it