In the Line application, you can use different ways to chat and make contact with your friends through private or public chats, text and voice messages, sharing videos and photos, making voice calls, etc.
In order to do all the above, you need to start a chat conversation with your friend.
Click on the empty field (shown with green arrow) to type your message, and click send.
For sending a voice message click on the icon shown below.
In order to make a voice call, follow these steps: