How does a 14-year-old who is 5'3'' and 135 pounds lose weight?

Diet(less greasy foods, more salads, and no pop,and drink lots of water)Exercise(jog a lap around a school track, go to the gym,or the weight room at school) and alos get involved in sports and other recreational activites that can keep you busy.

that maybe be good. but what happens if your like me who broke her foot 3 times and isn't a good athlete and cant do gym because of her foot???????? iam 5'3 120 pounds and 14 how do i lose weight???? and i cant exerize