By default, chat messages will not appear in the Mevo app while you are streaming, but you can adjust this setting if you prefer to see them.
Go to 'Settings,' and tap 'Live Streaming.'
Select either Livestream or Facebook, whichever one to which you plan to stream.
Periscope does not include a chat option.
Make sure the Chat switch to toggled On (green).
Now any comments will appear in the live edit view in real time.