It's very simple to create a recurring message and schedule it for the future. At the time planned, a notification will be triggered and you will have the option to send your scheduled message, simply skip it or remove that reminders altogether.
In order to start, simply visit your main tab and click on the little clock icon. It looks like this:
This will open a new view for you where you can select a contact, type a message and select if you want that message to be recurrent in the future ("Select frequency" section). That screen will look like this:
To activate it, write your message, add your frequency and click on Send. This will send the first message of the series instantly and then add that exact same message to the queue for the future.
You can create as many recurring and automated text messages as you want!