You can schedule the appointments with easily drag and drop functionality of scheduler.

Go to the Scheduler Menu: You will find a dropdown at the top right side of the screen, select Appointment.

You will find the list of unscheduled Appointments at the right side under Unscheduled Appointments(s).

Now select the appointment from the list, simply drag the appointment from the list to the Calendar date at which you want to get that appointment done.

As soon as you drop the appointment to the selected date, you will get a success alert popup.

Success alert means your unscheduled appointment is now scheduled.