If you have keys, press the right and left arrows. If its just a touch screen, then a Screen Selector object should have been put in somewhere by the previous programmer to get to the Config Screen.
If a standard PV1000 touchscreen, reboot and watch for the little square on the lower right hand side. Press this square to get into the config screen.
I'm not sure how the previous posts construed that this person wants to get to a "configuration" screen.
What do you mean by "change" or "setup"? If you wish to change the appearance or set up a new screen (or any screen if this is a brand new unit), you will need the software. Please be more distinct in your question...