You can play, experiment, change filters, messages, and anything else you want, then send a test message to yourself to see how it looks. If you don’t click save, then nothing will change. On the other hand, when you do like your changes, make sure you do click save otherwise the new stuff will be lost. Another way to say this is: You can’t break it as long as you don’t save it.

If you want to be double safe in your experimenting, start by duplicating a message (third button from the right on any message) and renaming it something like “Reminder Test”.

If a message is marked Disabled it won’t ever send anything to anyone. To change the disable setting, click on the pencil (edit) button. You will find the Disable checkbox right under the message name at the top of the edit screen. If the box is checked, nothing will ever be sent.