After redeeming a coupon by spending your accumulated Peanut Points, it will instantly show you a code, you can copy the code now to use at checkout or find it at a later time when you're ready.
If you're wanting to use the code at a later time and are having trouble finding it, make sure your logged into your account first! Click the Peanut Points button to open the rewards program window.
Next just scroll all the way down within the pop up window, click "Your rewards." From there you can see all the rewards you've redeemed by spending your accumulated Peanut Points. Click on the reward and it will show you the coupon code.