how to uncalibrate it?

Hi everybody first i thank u for yr help .the issue is I bought an alpha vision wf 1189 touch screen car dvd player. And, on the touch screen, i touch the tab "setup" and i entered password "888888" then "eneral setup “interface appeared. And on the setup I touch the tab "touch “after that on blue screen "+"sine appear. The screen calibrate.pls how does the touch command be functional again. On manual there is no solution to solve this problem. Thank you for your help