1. First turn on the computer, find the System Preferences option in the computer, and then click.
2. Then find the "Users and Groups" option in the interface and click Open.
3. Then find the lock icon marked in the following figure in the pop-up interface, and click.
4. Then find the "-"icon marked in the following figure in the pop-up interface, and click it.
5. Finally, find the option of "Delete User" in the pop-up interface and click it.