How do I require a password after startup?

Turn automatic login off

1. Choose Apple menu  > System Preferences, then click Users & Groups.
2. Click the lock , then enter the account password.
3. If you aren't logged in as an administrator, you're asked to enter an administrator name and password.
4. Click Login Options in the lower-left corner.
5. Choose an account from the “Automatic login” menu, then enter the password of that account.