I think it depends upon the humidifier. Do you have any instructions or look up the brand on internet. If you get confused which humidifier is best for you once check the latest reviews on GroomNStyle Top 5 Best Humidifiers 2015
I believe that you just have to add it with the water in the container. Here is a video detailing the product and its use.
http://www.expotv.com/videos/reviews/11/128/VicksV-105SG10GallonWarmMistVaporizer/257785
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