If the rear turn signal lamp (2), stop and tail lamp (1), and tail lamp (3) do not operate, have your vehicle checked by a professional workshop. Kia recommends to visit an authorised Kia dealer/service partner.
The LED lamp cannot be replaced as a single unit because it is an integrated unit. The LED lamp has to be replaced with the unit.
A skilled technician should check or repair the stop and tail lamp (LED), for it may damage related parts of the vehicle.