Place the oxygen cylinder: Place the oxygen cylinder vertically on a stable floor or on a special stand to ensure that it will not tip over.
Connect the regulator: Connect the regulator to the valve of the oxygen cylinder and make sure the connection is tight.
Adjusting the oxygen flow: Adjust the flow control valve on the regulator to set the correct oxygen flow according to the doctor's advice.
Connecting the patient's oxygen equipment: Connect the oxygen tubing to the regulator and the other end to the patient's oxygen equipment (e.g. nasal cannula, mask, etc.).

Check the flow rate: Make sure the flow control valve is set correctly and that oxygen is flowing at the proper rate.