When troubleshooting your Mac, it helps if you can log in as a different user. Instead of creating a new user, you can enable Root. Here’s how:
- Open Finder,
- Browse to Applications -> Utilities,
- Open Directory Utility,
- Click the lock to make changes,
- Enter your password when prompted,
- From the Taskbar go to Edit -> Enable Root User,
- Enter a new password for Root,
- Confirm the password and click OK,
- Close Directory Utility, and log out of your Mac,
- At the login screen, click the picture for Other…,
- Type the username root, with the password you previously set.
The root account should only be used when absolutely necessary, and when you know what you’re doing.