When your friends download the app, they will need to go to the Notifications Center and tap on the Promo Codes, then simply enter your unique referral code. Once done a $4.50 credit will be issued into their account. To view this credit, simply navigate to the History tab, the credit will appear there. To use credit, simply tap OC Flex Pass and proceed through the purchase cycle for an $4.50 OC Flex Mobile Pass and book a ride.