First of all, this question may sound null, but given that I have no networking background at all, I feel I should learn about this:

I have coded the program watching the videos, and put in a different GUI. The program works when I run the server&client programs on my computer, as it does in the video.

My question is, how do I share it with people? What changes are necessary in the code to be able to chat with other people?

Thanks for any kind of help.