Ford 2001 Mercury Cougar Owner's Manual page 145

Seating and safety restraints
3. While holding the shoulder and
lap belt portions together, route the
tongue through the child seat
according to the child seat
manufacturer's instructions. Be
sure the belt webbing is not
twisted.
4. Insert the belt tongue into the
proper buckle for that seating
position until you hear and feel the
latch engage. Make sure the tongue
is latched securely by pulling on it.
5. To put the retractor in the
automatic locking mode, grasp the
shoulder portion of the belt and
pull downward until all of the belt
is extracted and a click is heard.