Use a 10 mm socket wrench to loosen each bolt on the two battery connections, and remove the cable (starting with the negative terminal).
Additional details on how to safely remove your vehicle's battery can be found here.
Make sure to separate the two connections from the battery terminal to prevent any electrical current from flowing
After disconnecting the battery, wait at least 10 minutes to allow the electrical current to fully dissipate before attempting to remove the airbag.
Make sure to avoid touching the top of the battery terminal while using the socket wrench, as this can generate a spark and potentially cause additional damage.