Choose System Preferences from the Apple menu , then click here on Users & Groups.
Click the lock , then enter account password. ...
Click Login Options.
Choose an account from from the “Automatic login” pop-up menu, then input the password of that account.
The blog post is good. The article asks the question, that is, how can I boot up my new IMAC without signing in? Professionals in the field can help you. You should ask for the help of someone who is an expert in it so that you can fix your problem with ease.