The following will walk you through how to book into a Class session on the FitBox mobile app.
From the homepage of the FitBox mobile app (see here for how to set yourself up if you haven't already) you can book into the next 3 Sessions at your gym or click View more sessions.
If you click Book on one of the Sessions under 'Your Gym's next sessions' you'll be immediately Booked into that Session and it will appear under 'Your next 3 sessions.
You can also click View more Sessions which will take you to the Calendar page to see all the Sessions scheduled.
Select a Session from the list and you'll be navigated to the page for that Session where you can select to Book.
Once you've selected to Book, the app will update to show you are Booked and also provide you with the option to Cancel.