Once you have some subscribers added to your account you can start sending messages.
To send a message, go to the "Send a Message" tab.
Select the following:
- Your desired recipients for your message
- What date/time you'd like the message to go out
- Whether you'd like your message to be sent as SMS ("regular" text) or MMS (picture message, which allows for more characters and counts as 3 message credits each)
Then scroll down and type out your message content and tap "Send."
You'll then be able to view your sent message from the "Sent Messages Report" tab: