Guests can use Reward Points to redeem free items directly from the restaurant's menu on the web or branded app. To redeem Reward Points, you must be logged in to your Guest account. : How do I login to my guest account?
When adding an item to your cart, you will see a toggle near the Add Item button
If you toggle Pay with Points on, the total on the Add Item button will be zeroed out.
Click Add Item redeem an items using your Reward Points
You can now proceed to checkout.
The subtotal at checkout will exclude the item paid for using points.