Did you make the mistake of making your permanent WordPress administrator username… admin? This is something you should consider changing as it is one the main reasons for people easily hacking WordPress websites.
To make this change you will need to go to Users > Add New. Create a new user with your new username and grant them administrator privileges.
Now log out of your “admin” user, log into your new user and change the privilege of the user “admin” from Administrator to Subscriber.
You may even consider deleting the user “admin” and transfer any existing posts /pages to the new user. This is important for security reasons because you don’t want anyone to guess the username that has administrator privileges to your WordPress website.