The Origin replacement pods feature a convenient push-fit coil design for an easy coil change. To refill the pod, simply peel back the anti-leak silicon plug and place the tip of your e-liquid bottle in the hole. You can adjust the airflow by turning the airflow ring on the bottom of the coil to your desired position. Please note: After filling for the first time, let the device stand for at least 15 minutes before using to saturate the cotton.