1. Click the  New Chat button and click New Group Chat from the list.
2. Click the  Camera button if you want to upload a photo for your group.
3. Enter a name for your group, which is required to continue.
4. Click  next to create your group.
5. In the Create new group window, click the contacts from your suggested list or select Search, and then type the name of the contact you want to add. Continue searching for and adding up to 600 total contacts.
6. Select Done to start chatting. 

Learn more about customizing and managing group chats.