You will be automatically renewed and charged at the end of each month on your assigned renewal date unless you pause or cancel your membership or elect to skip the month.
Additionally, if you purchase add-ons you will be charged when you ship your box.
If you enroll and ship a box, you will be charged again before the end of the month to ensure that you have 1 credit for next month. If you enroll and skip your box, you will not be charged.