To send a voice message:
- Open the chat with a person you would like to send a voice message to.
 
- Click the
icon at the right side of the Message Input Area. 

- Click the
icon at the center of the Message Recording Panel to start/pause the voice recording. 

- Click on the chat
icon
 to send your voice message. 
To cancel the recording of a voice message, just click on the
icon at the upper-right side of the voice recording panel.