You can manually send text messages from within the application in each client's file under Reminders Log. You will first need to Activate Text Message Appointment Reminders in the application.
To send a message click Details from the list of clients > Reminders Log tab to the right. Then click Send Text Message Reminder.
A pop up window will show where you can enter the text message and click Submit to send to the client.
After the message has been sent it will appear below in the client's Reminder's Log.
Note: Text messages are $0.02/ea.