In your dashboard, select Trips (or Bookings in the account menu). There are three tabs: Upcoming, Past and Cancelled. On Upcoming you can search, and filter by All, Upcoming, Completed or Cancelled.
Each booking has Manage trip, Directions and, where allowed, Cancel. While you're parked, a Parked now banner at the top has Open gate and Manage. The View or cancel booking button in your confirmation email opens the same booking.

Manage trip opens the booking page. It shows:

Gate codes and entry details never appear on the public listing. They show up in your booking once it's confirmed and paid. For a booking request, that's after the host accepts.
Your 6-digit Access PIN and a QR code appear on your confirmation page after you pay. You can find them again here:
Every code stops working once its booking ends. Some driveways and open lots don't use a code. You'll just see the host's instructions.

On Access codes, select Share with someone to send your pass to one other person, such as a partner picking up the car. They see the same PIN and QR code.
Open the Gate trouble tab on Access codes and work down the list, then message the host. Still stuck? See Contact support.