hi pookie,the lid isnt held on by a screw it kinda locks in place under the top rail,you need to lift from both sides in the rear & tilt the rear of the lid upwards then it will slide out,if you are trying to lift the entire top lid at once it will never come off,if you look real close you can see that the leading front edge of the lid is wedged under the top rail.
mike.
mike.