well i depends on what kind of popular like the all that kind of popular or the kind of popular that alot of people know kind of popular i choose alot of people know you kind of way.well first of all if you see someone sad or alone or being bullied you should ALWAYS stand up for them or be nice to them and say "hey are you ok?" so to become popular and get people to know you just be nice and they will like you and if other popular girls that think there all that and USED to be your friend and are mean to you just ignore them.