There is only one vent in the lid, it is to vent the water mist. After placing the lid on the diffuser, rotate the lid so you are venting the mist in the direction you want.
It depends on the size of your diffuser, the oil and your preferences. With this diffuser I usually start with five to seven drops. Then I adjust to my liking.
I bought it from amazon.but from the first use ,i couldn't experience any fragrance even after putting 7-10 drops of diffuser oil . Don't know what is to be done
Yes, MIST MIST is exactly what a diffuser does. I'm glad you got that, but I'm sorry that you misunderstood the title. As it says I am reviewing the diffuser not the different oils or how to use oils.