The locking nut is a large plstic housing under the spray arm. You have to turn it (usually counter-clockwise) about 30 degrees to release tabs that keep it secured. Look at the pictures of the part at ;
http://c.searspartsdirect.com/lis_png/PLDM/G0606383-00005.png see item 454
If you cannot access this link, go to the searspartsdirect.com , and search dishwashers by your model number. Select any of the models that appear. then search for "spray arm". Select the sprayarm item in blue, then hit the back button and the diagram lists will appear. (Keep hiding the popup help windows.) Select motor pump mechanism. In the picture you can see the locking tabs on the lower inside edge of 454 that lock onto the outside tabs of part 450.
Keep an eye on that washer 453 not to lose it.
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