passcode change

I have had to change my sign in passcode, for some reason, fairly frequently. It doesn't always match my iCloud passcode. Whenever I have to use terminal to change my passcode on my macbook, I keep getting windows telling me I have to sign into keychain. I tell it to create a new Keychain but the windows won't go away. I have checked the keychain app and can't see what I am doing wrong.