How do you say a certain word and change an object's property?

I need help on a script command. I'm a terrible scripter. I need a command where when I say a certain word, it changes the brick color. Also only people w/ permission are allowed to do that command.

Here are a few snippets that you need

Game.Players.PlayerAdded:connect(function(NewPlayer)
NewPlayer.Chatted:connect(function(Message)
if string.lower(string.sub(Message, 1, 4)) == 'kill' then
-- Do action
end
end)
end)

Basically what we are doing :

• Listen or there is a new Player that joins the game
• Every single time he starts talking we are listing what he is saying.
• On Line 3 we take that message, and only listen to the first 4 Characters and convert that to all lowercase characters so that it doesn't matter or you say 'Kill' or 'KILL' or 'KiLL'.
• If that message is correct we execute the action (Fill in your code on Line 4)

Admin list :

• Learn how to work with Tables (See the Wiki) to understand how you should be able to make an admin table.