Yes. As there are limited bikes available, you need to book into each class.
You do not need to be a member to book. If you are not a member then you simply pay a casual entry fee when you visit the facility.
Members who book simply swipe-into the Club when they visit.
To book a bike within the class go to http://book.psycle.life
Note that you will need to setup an account to book a bike. There is no cost to setup an account.
The reason for having to setup an account is so that the statistics from the bike ride can be saved in your personal profile.