Ford 1998 E-150 Owner's Manual page 52

Seating and safety restraints
1. Position the child safety seat in a
seat with a combination lap and
shoulder belt.
Air bag can kill or injure a child in a child seat. If you must use a
forward-facing child seat in the front seat, move seat all the way
back.
2. Pull down on the shoulder belt
and then grasp the shoulder belt
and lap belt together.
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.
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