Ford 2001 Econoline Owner's Manual page 72

Seating and safety restraints
Stow the tongue end of the
detachable anchor.
2. Pull the seat latch handle, then
pull the seat toward the right side of
the vehicle to disengage four pins
from the floor mount.
3. Remove the seat.
To install the seats:
Check to see that the seat and seatback is latched securely in
position. Keep floor area free of objects that would prevent
proper seat engagement. Never attempt to adjust the seat while the
vehicle is in motion.
1. Position the seat to the floor
mount.
2. Engage the four pins into the
floor mount hole and push the seat
toward the left side of the vehicle to
fully engage.
72