What should I do to lose weight I use to be 145 pounds and now I am 182 what should I do?

Diet/exercise. Weight loss is a numbers game. You have to expend more calories than you consume. Eat less/exercise more.
Many ways. Start simple with 20 minutes a day exercise, low glycemic index carbs, 1 oz water per kg and decrease daily calories by 500 for each one pound you want to lose per week.