Within the diary you are able to send emails to patients from their appointments. To do this, click on the appointment of the patient you wish to send an email to. This will bring up the Appointment Details screen.
At the bottom, you will see the 'Communication' button. Select this and you will be given a number of options of different communications you can send to the selected appointment. At the top of the list you will have the options to send an 'Appointment Reminder' to the patient.
Further down the list is the option to 'Email' and when selected it will bring up all of the email templated that have been created for the patient category. You can select one of these and this will bring you to the email template that has been populated with all of the appointment details. You can add more information into the email but it will not be saved to the template.
To send simply click the 'Send' button on the bottom right hand corner.