NGT Lite for PC - Text and Read

Hello,

I would appreciate if anyone can give me some clarity as to how to use the Text and Read option in the NGT Lite app.

I installed the app on my PC (Windows 7) without any issues. In the settings tab, the "Text and Read" option is selected.

I managed to make a call and joined the call and saw the text from NGT but could not find anywhere where I can type my part of the conversation? 

Thanks.