How can I make my brick coled by the kilever could some one please show me how?

I'll list some documentation for this so you can get a look at how this works:

https://create.roblox.com/docs/reference/engine/classes/BasePart#Touched - touch event https://developer.roblox.com/en-us/articles/BrickColor-Codes/ - brick color

--

script.Parent.Touched:Connect(function(touched) -- when the part is touched, as well as it gets what has touched it with "touched"
    if touched.Parent:FindFirstChild("Humanoid") then -- if what is touching the part is a humanoid
        touched.Parent.Humanoid.Health = touched.Parent.Humanoid.Health - 25 -- set 25 to whatever value you want
        script.Parent.Color = Color3.new(0.101961, 1, 0) -- color you want it to change to
    end
end)

If this helps if you could mark my post as the solution that would be appreciated.