You can join a waitlist for the station if the station is not available for use yet. This will allow you to be notified when the station is available to use.
When you receive the notification that is your turn, you will have the option to accept or snooze. If you snooze or the timer runs out, it will notify the next person in line, while retaining your spot in the waitlist queue for when the station becomes available again.
After you have accepted you will have a certain amount of time to move your car to the station and plugin.
When its time to move your vehicle you will be sent a notification to do so, that way the next person can use the charger.