To fill it, the easiest option is to use a jug or bottle of water and fill the tank without removing it from the humidifier.
If you are going to fill it this way, disconnect the humidifier to avoid possible accidents
You can also use the handle on the tank to take it out and fill it using the tap.
When filling it, it is important that you pour the water directly into the tank, not through the steam outlet chimney. If water falls through the chimney, empty the water that is in the equipment, under the tank.
If when turning on the equipment after filling no steam is seen through the chimney, make sure that there is not an excess amount of of water in the equipment, under the tank, since an excess of water could block the air outlet, causing the the water in the tank and equipment overheat and damage the equipment.