Group messaging is only available for app users, with them you can chat and share content freely.
Open Messages Tab , all messages/conversations will appear
Click on the "Group" filter at the top of the screen
Select contacts to add to group chat from the list below
Enter the contact you want to add in the search field
Click on the contact to select it, you will see all added contact at the top
Note: You can add only the contacts that are using the application
Name your group in the "Group name" field and click "Create"
Everyone will be able to see the name of the group
A new screen of your group will appear where you can start the conversation
If you want to view or edit group info click on the group icon in the upper right corner.