SMS problem on BlackBerry 7290, please give me some advice

The desktop shortcut key of Blackberry 7290 is M. Once you enter the text message interface and press scroll, you can choose to create a new text message. As you said, pressing C means you can choose who to send the message to, which means CHOOSE in English. The meaning of selection is okay. If you want to reply to someone's text message, press the R key. If you have unread text messages, press the U key. Once you are familiar with these keys, it will be very convenient to send text messages