Remove the bolt, then remove the recline motor (A). The driver's seat on LHD model is shown; the passenger's seat is symmetrical; the ones on RHD model are similar.
Install the motor in the reverse order of removal, and note these items:
Replace the push nut with a new one. Make sure the push nut is installed correctly.
Make sure the recline motor harness is routed properly.
Apply medium strength liquid thread lock to the mounting bolt before reinstallation.