Labels can help you easily organize and find your chats and messages. You can create labels with different colors or names, and add them to an entire chat, group, or certain messages within a chat.
Swipe left on an individual chat or group > More > Label Chat.
Alternatively, you can add an existing label or create a new label. To create a new label, tap Add new label.
Note: You can create up to 20 labels.
To manage your labels, go to the top of the Chats tab and swipe down. Then, tap Labels.
Note: If more than two color coded labels are applied to a single chat, they'll be stacked one over the other. Stacked labels display the color of the most recently used label.