How to make ChatMakeSystemMessage visible for all players?

wait()
local player=game.Players.LocalPlayer
local rank = "[General]" --Example
local name = player.Name
local dev = "[DEV]"

player.Chatted:connect(function(msg)
        game:GetService("StarterGui"):SetCore("ChatMakeSystemMessage",{
            Text = rank..string.sub(msg,6,#msg);
            Font = Enum.Font.ArialBold;
            FontSize = Enum.FontSize.Size18;
        })
end)

When someone talks, "[General]" appears above their name, but it isn't visible for other players, why? Help, and thanks!