Enrolling in recurring shipments unlocks an extra 5-10% off thousands of products & is activated with your first order. You can set up flexible deliveries ranging from every week to every 12 weeks, and can make changes to your order contents & dates at any time.
That said, it's not required to use. Once you place your first order, you can visit your Recurring Shipments page to turn the feature off anytime. If you need any help turning it off, you can visit this article.