Need help completing my system? Tables?

I want to insert a player in to the table then see if a player inside of a table said something, BUT FOR NOW, i want to add the players to the table and remove them when they leave, could you give me tips on this?

local tab = {}

game.Players.PlayerAdded:Connect(function(plr)
	table.insert(tab,plr)
end)

game.Players.PlayerRemoving:Connect(function(plr)
	table.remove(tab,plr)
end)

This doesn't work, could you tell me why?

Use table.insert(tab, #tab, plr), this should fix it. If you post the error, I can tell you. For the chatting part, plr.Chatted:Connect() should work.