You can create 'Templates' for messages that you would want to save and send out frequently. Once you have templates created, they are available from the Messages screen.
To creat a template, tap on 'Templates' from the Dashboard, this is the first screen you will see. You will see a list of any templates you've already created and at the bottom you can choose 'Create Template':
Title your template, create your message, and don't forget to tap 'Save':
When you're ready to send the template, Go to 'Messages' and 'Compose a message' and search for the contact or tap the desired contact or group.
Use the twin talk bubbles icon at the bottom of the messages pane, select the template to populate the message box, and click send.