To manage your subscription, head to "Subscriptions" in your account. If you’re not quite ready for your next order, you can snooze your order to your desired date.
If you need to cancel, you’ll find the "Cancel my subscription" link under your order summary. You can still purchase SYC products without subscribing, but you will no longer have access to the perks that come with subscribing. Any progress made in your gift tracker will be lost.