Press the AirFloss handle all the way down in the Fill & Charge station to fully secure the handle. Make sure that the handle is touching the bottom of the charger. It is not placed correctly if you do not see the curved line facing down (under the Philips Sonicare logo)
Press the handle back towards the reservoir until you hear a click
It will take 10 seconds to completely fill the AirFloss handle
After filling the handle, press the eject button on the top of the Fill & Charge station. Your Sonicare AirFloss is now ready to use.