How to enable root user in snow leopard

Accessing the root account is disabled by default in Snow Leopard and the Directory Utility application is not available in the Utilities folder any more.

Here’s how to enable root in Snow Leopard:

1. Open Directory Utility in its new home, which is /System/Library/CoreServices.
2. Unlock the application by clicking the padlock icon and entering your Administrator login.
3. Select Edit » Enable Root User.
4. Choose Edit » Change Root Password, and choose a password for the root user.

That’s it! Make sure to re-lock the application by clicking the padlock icon.

Warning: Enabling the root account can leave your Mac vulnerable to security threats. Only enable it if you are aware of the risks and know what you are doing.

Source: MacOSXHints