To create an appointment you need to go to the "Calendar" page you will see in the right hand of the page an option to “Create New” :

You will then need to choose the “New Appointment” option, which leads you to fill in the following information:

After choosing the type of Service for the appointment, you would need to click on a date in the calendar. You will then be lead to another page where you can choose the Employee and Time of the appointment:

Upon choosing the time of the booking, you would then need to fill in the information needed to complete the appointment: