How to gain weight?

how 2 gain weight???/please tel me plzzz
m so thin my weight is only 40kg and my height is 182cm
plzzz help meee

im also thin and small...
what I was told to do was eat more greens (yuck)lol
and make sure you do stretches a lot this helps your bodys muscles.
and make sure you sleep reguarly.
but dont skip meals and starve yourself this does NOT help.
eat regulary but sensably.

Eat a lot of ice cream, eat right before you go to sleep thats when your metbolism slows down, drink weight gainer, eat a lot of fats like peanut butter, ect... slow down daily activities.

I don't think it's a good idea to eat fattening food just to gain wait!! I am 100% sure that what you should do is eat more good carbs, like potatoes and pasta, and whole grain breads and things of that nature. don't just eat fatty foods, that's not good for your arteries and all that.