Step 0- Login as "Admin"
Step 1- Go to the "Communication" section
Step 2- Click on the "Message" module
Step 3- Click on the "Send Bulk SMS" menu
Step 4- Select "Audience" (i.e. Parent/Teacher/Individual etc.)
Step 5- Select "Class/Teachers/Enter Mobile Number"
Step 6- Write Message in the Box
Step 7- Click on "Send" button