I removed the 7 screws on the bottom of the microwave that held the bottom sheet metal piece.
The piece dropped down , exposing the turntable motor. I ordered the parts I needed, the motor and the coupler (which had broken), and when they arrived the next day, I removed the 2 screws which held the motor in place and installed the new motor. I replaced the sheet metal piece and the 7 screw, and then put the coupler in the microwave, pushing it onto the motor. I replaced the glass turntable. Done.