Ford Mystique Owner's Manual page 104

All child restraint systems are designed to be secured in vehicle
seats by lap belts or by the lap portion of a lap-shoulder belt.
If you do not properly secure the safety seat, the child
occupying the seat may be injured during a collision or
sudden stop. An unsecured safety seat could also injure
other passengers.
Carefully follow all of the manufacturer's instructions
included with the safety seat you put in your vehicle. If
you do not install and use the safety seat properly, the
child may be injured in a sudden stop or collision.
When installing a child safety seat, be sure to use the correct
safety belt buckle for that seating position, and make sure the
tongue is securely fastened in the buckle. For a shoulder/lap
belt combination with a sliding tongue, make sure the retractor
is in the automatic locking mode.
Always keep the buckle release button pointing upward
and away from the child seat, with the tongue between
the child seat and the release button as shown in the
following illustration.
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