You can. That doesn't mean you should, but that's another question.
If your order has not shipped yet, please contact our support team immediately with your order number to request a cancelation. Our warehouse is very speedy and there's only a 24-hour window in which we can cancel orders.
Click the orange "Support" button in the lower right-hand corner and select "cancel order" from the dropdown menu.
If your order has already shipped, we will be unable to cancel or recall the package, but we do offer free returns! Feel free to open your package and try out the product. You have 30 days to decide! If you'd still like to return your order, click the orange "Support" button in the lower right-hand corner and select "Return" from the dropdown menu.