First, make sure that are able to be'super-user' by using sudo.
Run the 'visudo' command as root. It will show you the contents of /etc/sudoers where you should have a line like
# User privilege specification
root ALL=(ALL) ALL
Now you would need to add
yourusername ALL=(ALL) ALL
below that line, to add yourself to the 'super-user'-list.
Once you've done this, log out of the root account.
sudo passwd -l root
This will lock the root account.
To 'unlock' it again run
sudo passwd -u root
For more information about this, type
The sudo command temporarily gives a user (in this case you) root-privileges. It will ask you for YOUR password.
Be warned though, If you are using Gnome (I expect it to be similar with Kde) you will still be prompted for you root password when trying to run a Program that requires 'super-user'(or root)-privileges.
For example, if you were to configure the login-manager (gdm) from within gnome, Debian uses the 'gksu'-command to authenticate you as being root.
You need to manually change this by editing (with gnome's menu editor) the command that is called when you click on the corresponding link under the 'System->Administartion'-Menu to use 'gksudo' instead of 'gksu'.
Gnome now no longer asks you about the root password, but you need to do this manually for every app that requires this. It can be done, its just tedious.(This obviously requires gksudo to be installed!!!)
I expect this to change in the near future though, as Debian now asks during installation if the root account should be disabled, its just taking them to adapt their programs (such as gnome) to behave accordingly.