Line up the pre-drilled holes in your actual fan blade with the holes in the blade bracket.
Screw the bracket onto the blade for your first blade, and complete the process with every other blade.
Screw the blade brackets (holding the fan blades) into the fan component on your ceiling one at a time.
Tighten the screws to make sure that the blades are secure. Do not tighten them so tight that the blades start creaking or cracking, because this may cause damage to the blade itself.
Repeat the process for each windmill blade.