[Giaguara]

Root is disabled by default: it is often for teh safety as well, if you don't know what you are doing with the root access you can damage the system. So annoyingly you'll have to able the root.

One way to enable the root is to boot off the install CD, and look under the Install menu for the "Password Reset" option. You can use this to change your own password if you forget it, and to enable the root account. This utility will not run if you copy it to your hard drive. It only works when booting from the CD.

The second way is probably the easiest - from terminal typing

sudo passwd root

You will be asked for the new password.

A third way to enable is is from Netinfo Manager (in Applications/Utilities);

1) Open NetInfo Manager
2) Select "Users" from the second list.
3) Select a user you created andnd know the password for!
4) Double-click on the value across from "passwd" and copy it. It is the encoded form of the password for that user.
5) Select "root" from the list of users. Find the "passwd" value (default is "*") and paste over it.
6) Exit Netinfo Manager.
7) Open the Terminal and type "su root".
8) Enter the password for the user chosen above.