When The Carbonator arrives we recommend that you refer to the instruction manual included. We can also send you a digital copy if you email us.Quick steps: Insert the gas cylinder into the base and twist into place. This will enable you to pump the gas into the bottle.Fill the bottle with water to the fill lines shown.Connect the bottle to The Carbonator by twisting into the machine.Press the button on The Carbonator firmly for 3 seconds and release. Then repeat this process. You should hear a hiss at the end of each release.Unscrew the bottle and serve.Enjoy!Our products are put through rigorous testing during production. If you are experiencing difficulties when using The Carbonator for the first time, try disconnecting everything from the machine and starting the process all over again. If all steps have been followed and you find that you are still having difficulties with the machine then please get in touch with us and we'll be glad to help. Usually this is a cylinder issue and can be resolvd by changing the cylidner. In the first instance please email us at refill@co2you.co