You can send messages to other players through the Chat Menu.
Via Chat, there is "Normal Chat" which sends fixed messages, and "EX Chat" which sends lines from the character being controlled along with voice clips. You can also freely enter any text you like and send it.
By pressing the touch pad button, you can open the Chat Screen without having to open the Menu.
Normal chat allows you to edit and register the fixed sentences freely. It's convenient to register frequently used phrases.