Mitsubishi Galant Owner's Manual page 41

Seat and restraint systems
To remove
Press the lock knob (A) in the direction shown by the arrow.
Then pull the head restraint up and out of the seatback.
2
WARNING
!
To help minimize the risk of neck injury in the event
of an accident, the head restraints must be properly
installed and positioned to proper height before
vehicle operation.
To install
First check that the head restraint is facing in the right direction
as shown in the previous illustration, and then insert it into the
seatback. Push the head restraint down while pressing the lock
knob (A) until the restraint locks into place.
2-14
CAUTION
!
Check that the lock knob (A) is extended out as
shown in the illustration. Then pull the head
restraint up to make sure that it is locked in place
and will not come out of the seatback.