Because of the security implications of root access, Linuxconf requires you to verify that you currently have access to the root account.
Open Config => Users accounts => Normal => Change root password.
You'll first need to enter the current root password to verify access to the root account.
Once you have entered the current root password, you will be prompted for a new password. In the Confirmation field, type the password again. This is to prevent you from mistyping the password. See the section called Adding a User Account if you need guidance on choosing a password. Be sure to choose a good password! If you decide against changing the root password, just select Cancel. Once you have entered the new password, select Accept.