You need to use the component of the force resolved perpendicular to the line connecting it with the moment point.
If it was parallel, there would be no moment. Imagine if you had a sheet of square paper which was attached to the table at one corner with a drawing pin, if you pulled on the opposite corner in the direction of the diagonal from the pin to your hand, then there would be no moment clockwise or anti-clockwise. If you changed the direction you were pulling in, how would this affect the moment of your hand's force on the paper?