Want to send a message to just one or more of your contacts? 

Click on Home > Quick message.

NOTE: The Quick Message option DOES NOT check for unsubscribed status and the SMS account will send the message/s to all the numbers you type into the mobile number box. If you don't want your unsubscribed contacts to receive the message, add the numbers into a group and book the Message here: MESSAGES > New Message, which will check for OptOuts before sending out.