If you'd like to make changes to your SMS templates, simply head to Appts> SMS Reminders.
Select the Setup button in the bottom right corner of the window and you will be presented with the following screen:
Right click on the record in the Template column and select Edit Template. Choose the Template you wish to edit and you will receive the below window:
Make the appropriate changes as necessary and then choose OK.
For more information on SMS messages, please refer to our SMS Reminders articles