What can I change to make it work?

function onTouch(part) --function
    local message = Instance.new('message',game.Workspace) --creates new message
    message.Text = "You touched a brick!" -- What the message says
    wait(2) -- how long before message is destroyed
    message:Destroy()--Destroys the message
end

script.Parent.Touched:connect(onTouch)

(puts a message on the screen)