Are you able to create this system locally for a single player?
Write, save, and load messages using your preferred data structure. An array would be suitable.
If you can do it locally, send the entire array or dictionary object as json to a firebase/database key which all your users can access. Everyone user will download and update the same data on your database server.
Hey oosyrag -- and ASHLEY. Turns out, I don't know how to save textbox messages locally with dictionary and JSON... I tried to figure it out by myself, but I can't find any good tuts on how to save and retrieve the text from a textbox. Could you (or someone else) guide me in the direction a decent tutorial?