You can move to the 1:1 chat screen by tapping a LINE friend on the list.
Compose a message in the input field at the bottom of the screen and tap the send button on the right to send the message.
You can also send a photo from the image button on the left.
When you receive a message from a LINE friend, the message is automatically reflected. If you receive a message when the chat screen is not open, you will receive a push notification on your device.
To return to the list screen, tap the button on the upper left.
Next: Search a LINE friend (App)