why is my plugin not working? [SOLVED]

I'm making a bunch of new plugins. Here is one:

local toolbar = Plugin:CreateToolbar("Troy's Lighting Tools")
local button = Plugin:CreateButton(
"Enable Time Changer",
"Click to enable time changer; a feature that will change the TimeOfDay untill you close studio.",
"http://www.roblox.com/Sun-cutie-mark-item?id=152525784"
)
local mouse = GetMouse()
local hit = mouse.Hit
function onhit(hit)
m = Instance.new("Message", game:GetService("CoreGui"))
m.Text = "Untill you close studio, the time will always be changing."
wait(5)
m:Destroy()
game.Lighting.TimeOfDay = TimeOfDay+1 -- the timeofday is a string, but holds numbers.
end
mouse.hit:connect()

my problem is that I don't know how to get the user's mouse. (too bad plugins don't run localscripts.) I've seen it done like a thousand times. Can someone help me on this? Thanks for reading!

EDIT: The toolbar is not there even.OH MY GOD WHY DO I MAKE SO MANY MISTAKES??????!!!!!!!!!!!

EDIT 2: On line 4, it says that statement spans multiple lines. On line 8 it says (unknown global 'GetMouse'). finally on line 15 it says (Unknown global 'TimeOfDay').

The variable is plugin not Plugin.

To add time to the Lighting, it has to be done like this: game.Lighting:SetMinutesAfterMidnight(game.Lighting:GetMinutesAfterMidnight() + 1)