found it under their terms and conditions
" If at any time you wish not to receive the monthly editor’s box, it is the user’s responsibility to make this known by midnight on the 24th day of the month (5 days after the selection email will be received). In this case your credit card charge will be suspended until the following month when you will either choose to receive your Sneak Peek Box, gift it to a friend, or skip that month as well. "
"We will do everything to make your membership as satisfying as possible. However, you are free to cancel your membership any time by calling customer service at 1-877-651-3292. You must cancel your membership by 11:59pm on the 24th of the month to avoid being charged on the 27th for the next month’s shipment. If you have any questions please email: email@example.com or call: 1-877-651-3292"