Set your camera on a sturdy tripod.
Set to Aperture Priority - might be denoted by 'A' in your mode dial.
Set your aperture to... say around f8
Set your ISO value to around 200, best is 100 (that is... if your camera support it).
Switch off your image stabilizing system
Take your photo.
Preview it... if found too dark, then step up your EV then take photo again.
There this is the steps that I normally do when shooting night landscape.