On your compose page, look out for the two fields for loading contacts. The first field is for uploading contacts from external file and the second is for directly typing in your phone numbers.
Above the second field you will find a link that says add phonebook contacts.
Click on this link for a list of all groups in your phonebook
On the pop-up screen, click the add button beside the group you wish to send messages to.
Click on the add button beside any other group you also wish to send message to
When you have added all required group. Click the close window button.
You can hence continue composing your message.
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