I wanted to know more about the roblox chatting system, I wanted to know things like, can we modify its GUI? Can we save the chat? Basically anything you can tell me about roblox's chat put below, thanks!
You can modify the GUI. I've seen an article on the wiki, so i recommend you go check that out (too lazy to link it). Also, one of the ROBLOX admins (in the wiki) made an un-copylocked game of a custom chat for you to check out, so i recommend looking at it!