Attaching the Crank DonutTM to secure your casement window is VERY fast and easy !! 1) Open the window to the desired position, with the crank pointing upward (12 o'clock position) 2) Rotate the key clockwise to fully open the center hole in the Crank DonutTM 3) Tilt the Crank DonutTM and guide the center hole over the handle of the crank 4) Hold the Crank DonutTM horizontally at the top of the crank handle and turn the key counter-clockwise ~ the Crank DonutTM is now locked onto the crank handle 5) Remove the key and lower the Crank DonutTM to rest on the crank handle Removing the Crank DonutTM is the reversal of the attachment process