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Tap the Chat Head to start messaging, and when you are done, tap the Chat head again and return to what you were doing. Text messages and Facebook messages both share the Chat Head design so there's no difference between the two.
To close the chats, you can pick up the Chat Head and throw it away at the bottom. Or pick the whole group of messages and do the same.
Go to the Google Play store to install the app. You can install it one time only, or make it a more permanent fixture.