Yes! You are able to make changes for future weeks.
Go to your Meal Plan Preferences page. Then click on “Settings”.
You'll see the number of meals you're currently receiving each week, serving size, and your delivery date under "Weekly Settings" as shown below. To make a change, simply click on the drop down to the corresponding change you'd like to make. Here you can change the meal preferences, delivery date, meals per week, and serving size. Please note, changes to the meal plan need to be made before you receive the "meals for next week" email on Monday morning. Any changes after that time will be reflected the following week.