Kia SOUL Owner's Manual page 45

When using the rear centre seat belt, the
buckle with the "CENTER" mark must be
used. (if equipped)
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To release the seat belt:
The seat belt is released by pressing the
release button (1) in the locking buckle.
When it is released, the belt should auto-
matically draw back into the retractor.
If this does not happen, check the belt to
be sure it is not twisted, then try again.
Safety features of your vehicle
B210A01NF-1/H
Stowing the rear seat belt
The rear seat belt buckles can be stowed
in the pocket between the rear seatback
and cushion when not in use.
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