One Click Demo Import - Ceres fullscreen

Good evening,
I bought last week a new theme I just starting to use it

I have import the theme “Ceres fullscreen” and could you say how I can change the name on the top, on the left screen “CERES blacksilver” " by my name or I can do that?
How can I see my old website because when I had imported “CERES black silver”, my web change automatically to the demo CERES fullscreen
thanks in advance for you help


Contact with your purchase item author hope they will helped!