my Apple ID is being used to sign in on the web near my state. I changed apple id several times. my computewr i

To remove Guest User - while logged in on your Admin Account >> System Preferences >> Users & Groups >> Bottom Left is Padlock >> Open it - will required Computer Password to unlock >> Guest Use and Turn it OFF. ReLock the padlock and done.

Change your Apple ID password and never ever give it out to anybody

Below will change the Computer Password

Intel Computer

1 - Restart computer and immediately hold Command + r keys

2 - Top Tool Bar >> Utilities >> Terminal

3 - Type resetpassword as one word and no spaces

4 - Press Return key

5 - Follow the prompts and remember the New Password

And never ever give it out to anybody