Click the + Button on the Main Screen to create a talk room and choose a room passcode to invite members.
When you create a talk room, a room name is automatically generated based on the creation time and date. You can change the room name by tapping the icon to the right of the name.
You can also customize the talk room by changing the room icon image and the background image displayed during the conversation.
See section "8-4. Conversation group settings" for details.