To chat with a friend
Touch the Apps Key
> Talk 
.If you’re already chatting with someone, you can touch the Menu Key
> Friends list 
to return to the Friends list.Touch the friend you want to chat with.
Enter your message then touch the Send.
The messages that you exchange are displayed on the screen and include information about the chat, such as whether it’s on-the-record, the time a message was sent (if there’s no response after a short while), etc.
To enter an emoticon (smiley), just touch the Menu Key
>
More 
> Insert smiley to open a list
of emoticons.Your chat session will remain open until you end it.
Friends you’re chatting with are displayed at the top of your Friends list, with the most recent message displayed in a black-on-white balloon.