Belinda, This job is somewhat "tricky" and there are a couple of steps you need to take which are in addition to removing regular shocks.
Put the car on jack-stands with the suspension (springs) compressed. Not on the frame rails as the shocks will be at full extension and they will be "topped out" which means the attaching bolts will be in a stretched position.
If there is a Shrader Valve (looks like a tire valve) at the top of the shock check the pressure with a common air stick. Wright the pressure down. Remove the centers of both Shrader Valves to let the compressed air out and simply unbolt the shocks.
If you intend to replace the shocks with another set of air shocks take their pressures, let the air out and install the shocks. Re-inflate the air at the same pressure.
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If there is no Shrader valve on your shocks jack the car up with the rear coils springs under compression. Use a bottle hydraulic jack or a floor jack to remove the compressed tension on the bottom of the shock absorber and remove the bolts. When the bolts are out if there is still compressed air in the shocks they will extend when you release the jack. Unbolt the tops of each shock and reverse the process.