From the Add-on menu click on Advanced Messaging.
Advanced Messaging is a 3-step wizard
In step 1 you enter the recipients
In step 2 you enter the message
Step 3 sends or schedules the message
Choose the recipients of the message either from sheet or manual entry.
If you have mapped columns for Group or Campaign properties, it will allow to choose between them.
Here you can choose the type of message SMS, Viber or Viber with fallback SMS and the rest of the properties of the message.
Send your new message now or schedule it in the future.