NOTE : SMS should be INTEGRATED for the clinic, before we start with the below steps 

1>> To complete SMS setup, Go to Settings and reports >> Organization Details & Other Settings >> All Parameters Setup as shown below 

2>> Click on SMS set up on the left and you will be able to set up the following SMS reminders.

3>> To enable a client for SMS, Please go to the Client dashboard and click on Edit file as shown below 

4>> Enable the option which says " Client has Authorized Text/SMS Message " as shown below 

       Now this client will be enabled for SMS