I am 22, born healthy and plump but i am really underweight now, my bmi is 14.17, i am vegetarian, kindly suggest me the steps i should take to gain?

Need more info: Before deciding if you need to gain weight, it would be useful to know your current weight and height. It would also help to know if you are a strict vegan, or a lack/ovo vegetarian.When attempting to gain weight,you want to build lean body mass, which requires protein. You may benefit from speaking with a nutritionist. Your local hospital may have a person that can help you with this issue.