Login to your Spot Club account and swipe up on the arrow, above Reserve, to view the menu. Tap on Spot Club Account and scroll down to My Information and tap on My Coupons & Discounts.
You will then be able to view all your current coupons and discounts linked to your account. To add a new coupon, tap Scan Coupon at the bottom and move your phone so the bar code of the coupon is in the box. Now at checkout when you scan your QR code in the app, the best discount will be applied to your stay.