How to make something so if a player types in the chat /remove the GUI text will change?

I am trying to make it so if a player types /remove the GUI text will change to "hi". I've used a Script, do I need to use local script?

Script;

game.Players.PlayerAdded:Connect(function(Player) Player.Chatted:Connect(function(Chat) if Player.Chat == "/remove" then script.Parent.Text = "hi" end

https://developer.roblox.com/en-us/recipes/Add-Chat-Commands