Go to the Messages button and press the + icon.
Press New Group, and choose a name for your group chat. Then select the users you'd like to be part of the group. Then Click Create Group.
This will create the Group Chat and allow you to start chatting, sharing files and leaving voice notes with the group.
Clicking on the (...) on the right of the chat takes you to the chat settings
Then click the Edit Button to upload a Group Chat Image, Rename the Group Chat, and Delete the Group Chat.
You can then also Add Users, Pin Chat, Mute Chat or Leave Group.