Here is the answer to this question.
In order to lose weight, you have to subtract calories. Safe weight loss is 1-2 lbs/week, so in order to lose 1 lb/week, you'd have to drop 500 calories from your BMR each day (1 lb is equal to 3500 calories, so 500 calories X 7 days = 3500 calories or 1 lb). OR you can drop 250 calories from your diet and increase exercise to use an additional 250 calories.
Changing up calorie counts and exercises will help prevent plateau.