Fiat 2014 500 Owner's Manual page 32

30 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
2. The seat belt latch plate is along side the pillar near the
back of your 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 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