To view your messages, tap the chat bubble located at the bottom right hand corner of the app. A red dot indicates that you have received a new message.
Upon taping the chat bubble, you will be brought to a page with all of your conversations.
A green dot next to the user indicates that he is online.
The yellow circle next to the chat shows how many unread messages you have with that particular user.
To view chat history, tap on the message, next to the user's profile photo.
If you want to view the user's profile, tap his photo on the left hand side of the message.