Improve Chats

[Beneficial-Insurance]

At the moment, chats between nations are unsatisfactory. In order to receive replies from other players, the entire page has to be reloaded manually. This is both inefficient and a pain to the user. A better system would be to have a chat that reloads it's contents every x minutes (1 minute, two minutes?). This would prevent spamming ctrl-r every ten minutes.
I found this [https://code.tutsplus.com/tutorials/how-to-create-a-simple-web-based-chat-application--net-5931] tutorial, and I would be willing to try, but for the fact that I have no clue how this website works, where the chat code is, or where the database code is. In addition, I have never touched PHP in my life. However, I would be willing to watch youtube-tutorials etc if:
a) this feature was wanted
b) Someone could point me to the right place for where the chat code is.