Be sure you're logged into your oVertone account, then add the products to your bag and click Check Out, which will take you to the checkout flow.
If you're on your phone, tap Show Order Summary at the top of your screen; this will show the items in your bag and a dropdown menu you can use to select the amount you'd like to save! Click the arrow button when you're done, and a discount code for that amount will auto-generate and apply to your order!
If you're on a desktop, you'll see a slider labeled Redeem Points on the right-hand side of the page, between the item summary and the order subtotal. Slide to choose the amount you'd like to save, and click the Redeem For $___ button. A discount code for that amount will auto-generate, and apply to your order!
Please note: you can save $1 for every 100 points you have, and can redeem up to $100 at a time.