Delete 'chat history' or conversations on your Android device
When you are logged in, tap on the 'chat bubble' icon (second from the left) on the top toolbar to open a list of your previous conversations.
Press and hold down on the conversation or conversations (one at a time) until a check mark appears to the left of the conversation(s) that you want to delete.
Now look to the top right of the screen where you should see a 'trash can' icon.
Tap on the trash can icon and your conversation(s) will be deleted.