Jeep Wrangler Owner's Manual page 50

48 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
2. The seat belt latch plate is above the back of the front
seat and next to your arm in the rear seat. Grasp the latch
plate and pull out the belt. Slide the latch plate up the
webbing as far as necessary to allow the belt to go around
your lap.
Pulling Out The Lap/Shoulder Belt Latch Plate
3. When the belt is long enough to fit, insert the latch
plate into the buckle until you hear a "click."
Inserting Latch Plate Into Buckle