1. Open "Login Window" settins dialog

- from left corner of upper bar click on "System" menu, then click "Administartion" menu, then click "Login Window" / System-->Administration-->Login Window /.

2. Click on "Security" tab to open security settings dialog.

3. Mark / check "Allow local system administartor login" option

4. Click "Close" button

5. Open "Users and Groups" settings dialog

- from left corner of upper bar click on "System" menu, then click "Administartion" menu, then click "Users and Groups" / System-->Administration-->Users and Groups /.

6. Click on root to select it and then click "properties" button

7. Type password you want to use for root in "User password" fiels

8. Type password you want to use for root once again in "Confirmation" field

9. Click "OK" button.

That is it. On next login you will be able to use root account