What do you want to see on it?
Press the Menu button to see the menu.
Press the Info button to see the shooting info screen.
Press the Playback button to review the pictures you've already taken.
If you want to use the LCD screen for shooting, then you're out of luck. The D40 does not have the Live View capability. The camera is designed to function as SLRs have for the last half century: you frame the picture through the viewfinder. I realize this isn't the answer you wanted to see, but that's the way the camera works.
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