This link will assist you in replacing your microwave door handle.
Replace kitchenaid microwave door handle.
Answer shirley please see the following link to our repair forum.
Look at the inside.
Shirley s for model number kichenaid microwave mod khms 155lss 4.
Replacing a door handle on most appliances is no big deal but a microwave is not the usual appliance.
Please open the microwave door.
You will see a plastic insert called the choke.
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You will need some kind of a thin flat blade and work it all around the outside then when loose remove.
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You now should be able to get to the screws for the door handle.
Let me know how you come out on this.
Thanks for your question it is appreciated.
This type of repair will need to be completed by a service technician since it will involve the disassembly of the door a major shielding component in the microwave.