[racket] Simple Chat system in Racket

Hello, I'm a Computer Science student and I'm learning Racket this semester
and I am really enjoying it, so I wanted to do a simple chat system with it.

I have a basis that I learned Realm of Racket (a simple chat is a Challenge
in the Chapter 13) - and it says there to see HtDP2 for hints, but I could
not find the hints.

I even made a small hello world chat but I am having a lot of difficulty
going ahead, I would like to ask anyone for any materials on the topic,
hints, any help will be very helpful, thanks!
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