1) From the chat, tap the small microphone icon next to the text input field, and you will see a big circular microphone button. 2) Press and hold the microphone button and start talking. You will see the sound wave capturing your voice message. Keep holding the button while you talk.3) To send the voice message, just release the button. To cancel the message, drag up and wait till the background changes to red, and then release the microphone button. The voice message you have just recorded will be canceled. Once it’s canceled, you can start recording new message. 4) To switch back to text input, just tap the keyboard icon next to the text input field.