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To use your finder scope properly, you need to align it with your main scope. So what you see in the cross hairs is what you see in the centre of your eyepiece.
During the day, aim your scope at a far object. (not the sun obviously) the corner of a building, the top of a light post. Use a 20mm eyepiece in the scope and the 3 adjustment screws on the finders scope ring to centre it.
Once you have your object in the centre of both scopes, refine your adjustments by changing eyepieces to say a 12mm.
You can do this at night, but it can be a right pain if you're not familiar with your scope.
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