While pointing you to the control would be helpful, rather than having you wait for someone who owns one of these to come along, I have a solution that will let you find what you want along with all the other things that you will eventually need to know about the car:
The owner's manual for your Kia Sephia can be found here:
... I hope you take the time to look through it and find all the other goodies on your new (to you) car.
As a note, the cruise should be on the stick on the left hand side of your steering column if your car came with it. Not all cars do, believe it or not.
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