Step 1: Click on the 'Message' icon, Choose 'SMS'.
Step 2: Click on 'Bulk SMS' on the SMS tab.
Step 3: Click on 'Download' and fill the excel file with the required information and save it. After filling the information, Click on 'Choose File' and upload the same excel file.
Step 4: The numbers will be verified. You can write the message content in the 'Send SMS'.