If you look at the picture to the left, you will notice two keyouts (dark rectangles) in the center of the lock, one pointing to the left, and one pointing up. The one pointing up is the fully locked position which is where you can take the key out of the lock and both cables will be locked and the Bolt Lock itself will be locked to the washer.

If you insert the key in the fully locked position then turn the key clockwise (CW) 90 deg. The slot on the right is open. Another 90 deg. CW opens the Bolt Lock so you can slide it over the washer. Another 80 deg. CW opens the left slot. The final 90 deg. CW you are back to the fully locked position.

Note that the "L" shaped ends in the picture to the left are shown on the outside of the lock to show how the ends should be pointing in the fully locked position.