If you start the engine when the steering wheel is turned 90 degrees to the left (or right) after a couple of seconds, “Align steering wheel” illuminates on the LCD display for 5 seconds.
Turn the steering wheel to the right (or left) and make it turned to the left (or right) less than 30 degrees.
Kia Cee'd JD Service Manual: Flex Steering Description and operation
Instruction
Flex Steering is system to choose the three modes power steering depending on
driver preference or driving conditions.
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Display on the cluster but power steering is ...
Kia Cee'd JD Service Manual: Rear Seat Belt Buckle Components and components location
Component Location
1. Rear seat belt buckle [LH]
2. Rear seat belt buckle [RH]
...