Method -1
Step-1 Select “My computer” and press Right click on it and chose a “Manage” options. or Press Windows+R Key and type compmgmt.msc in Run Box and hit enter.
Step-2 "Computer Management windows" will open, and Select System Tools from Right window pane and after that Go to "Local Users and Groups" and double click on it.
Step-3 Now Click on "Users" and you will see all the login accounts of your computer. And after that select your account.
Step-4 After selecting your login Account press Right Click on it. And then choose "Set Password" option.After that one pop-up box will open and click on "Proceed".
Step-5 Enter the New Password and conform them, then click on "OK" Button.
Step-6 Now your login Password has been successfully changed .you can restart your system and check with your new password.
Method -2
Change password with "Command Prompt"
Step-1 Firstly go to windows start menu and type "cmd" in search box . Then select cmd and Run as Administrator.
Step-2 After that type below command in cmd
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