If you don't have an existing subscription, you need to select the product(s) on the website, click “Subscribe and Save 15% + Free shipping”, and then check out as usual. If you already have a subscription, login to your subscription account, next find the product you wish to add to your subscription on our website. Click "Add to next order on your next order date“ a popup will appear with the option to add the product to your next order or to add the product(s) to your subscription) and click "Add".