See if this assists you.
"How do I change my password?"
How to Change Your Password in Windows 8: 10 Steps (with Pictures)
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"Can I sign in to Windows without a password?"
http://windows.microsoft.com/en-us/windows-8/disable-remove-password
To switch from a Microsoft account to a local account
-  Swipe in from the right edge of the screen, tap Settings, and then tap Change PC settings.  
 (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, click Settings, and then click Change PC settings.)
- Tap or click Accounts, and then tap or click Your account.
- Tap or click Disconnect, and then follow the instructions.
To remove an existing password from a local account
If you're using a local account with a password, you can delete the password to sign in without one, but we don't recommend it.
-  Swipe in from the right edge of the screen, and then tap Search.  
 (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Search.)
- Enter sign, and then tap or click Sign-in options.
- Under Password, tap or click Change.
- Verify the current password for your local account.
- Leave the New password, Reenter password, and Password hint fields blank, tap or click Next, and then tap or click Finish.
Now, you (or anyone) can sign in to your local account and use your PC without a password.
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"How to Automatically Sign in to User Account at Startup in Windows 8 and 8.1"
http://www.eightforums.com/tutorials/2894-log-user-account-automatically-windows-8-startup.html
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"How to use a PIN to login to Windows 8"
https://www.bleepingcomputer.com/tutorials/use-pin-to-login-to-windows-8/
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"Password - Create for User Account in Windows 8"
http://www.eightforums.com/tutorials/7666-password-create-user-account-windows-8-a.html
And at the end of that page there are many Related Links about Windows 8/8.1 Passwords.
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"Passwords in Windows: FAQ"
http://windows.microsoft.com/en-us/windows-8/passwords-in-windows-8-faq
Cheers.