Go here to add an e-coupon good for 20% off your apples purchase via SavingStar. The e-coupon is located towards the top of the page (looks like the picture below) and is valid through 6/29/15.
Remember that SavingStar savings does not come off at the checkout, but get added to your SavingStar account. If you are unfamiliar with SavingStar, see my post here which explains more about it.