i have replaced the battery of my car then the airbag light on ,so how can i reset it
You will need a scanner that car read Hyundai airbag codes.
Here are a couple:
There is an OBD2 port right under the dashboard on driver side. Plug the scanner in. Turn on the ignition.
Follow the instructions on the scanner to read and clear the codes.
You will need to read the fault code with a scanner that can retrieve airbag codes.