A few troubles that I have created have now been corrected.
I typed in the wrong domain name (cuemba2006.hk) for the new site when I set it up in Site5, then installed WordPress at its root which obviously didn't work. Now have last installation removed, as per advice by very good Site5 support, a new one is now installed and the domain name emba2006cu.hk issue corrected, no sweat, thank God.
Next step would be moving of database which I have practised already. Wish me luck.
PS: Site5 support has also helped me to correct the wrong domain name reference in couple of places within the control panel.