Jeep 2004 Liberty - Manual (Page 66)

If the belt still can’t be tightened, or if by pulling and
pushing on the restraint loosens the belt, you may need
to do something more. Disconnect the latch plate from
the buckle, turn the buckle around, and insert the latch
plate into the buckle again. If you still can’t make the
child restraint secure, try a different seating position.
To attach a child restraint tether strap:
Route the tether strap over the seat back and attach the
hook to the tether anchor located on the back of the seat.
For the outboard seating positions, route the tether under
the head restraint between the head restraint posts.
66 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE