Waivers - You can create a Waiver at anytime, you don't need a booking.
To sign a waiver you need an account, so on the next screen, please either login or register.
If you're bringing someone else's child, you can sign a waiver as a 'third-party responsible adult' or have their parent create one, then find it during self-check-in. The child may already have a waiver.
Everyone needs a waiver to be booked into the park.
Dev Guy