Honda 1990 Accord Sedan Owner's Manual page 6

Trunk
The trunk can be opened by pulling up the lever at the left side
of the driver's seat. To open the trunk lid from outside, put the
master key in the lock and turn clockwise. The trunk lid opener
lever is lockable with the master key.
Lock
Keep the trunk lid closed while driving, to keep
poisonous carbon monoxide exhaust fumes out of the interior;
prolonged exposure can cause unconsciousness that may lead
to death.
Child Proof Door Locks
The child proof door locks are
designed to prevent accidental
opening of the rear doors. To
activate the locks, push down
the lock tabs located on each
door, then close the doors.
When the doors are locked in
this way, they can only be
opened from the outside.
Pull up
MASTER KEY
Open
LOCK TAB
Lock