How to weld a model to player's torso?

well uh read the title...

game.Players.PlayerAdded:Connect(function(Player)
Player.CharacterAdded:Connect(function(Char)
local Part = Char:WaitForChild("HumanoidRootPart")
local Weld = Instance.new("Weld", Char)
WhatYouWantToWeld.CFrame = Part.CFrame
Weld.Part0 = Part
Weld.Part1 = WhatYouWantToWeld
Weld.C0 = Part.CFrame:inverse()
Weld.C1 = WhatYouWantToWeld.CFrame:inverse()
end)
end)

you can try this model of mine, which was months ago, i hope you get what the scripts say: https://www.roblox.com/library/868174364/R6-ONLY-Welding-Basics-by-anphu04

As shown in the wiki http://wiki.roblox.com/index.php?title=Weld. Note that im using a serverscript.

---- Weld Function taken from wiki (note only 2 parts can weld with this function)----

local function weldBetween(a, b)
	--Make a new Weld and Parent it to a.
	local weld = Instance.new("ManualWeld", a)
	--Get the CFrame of b relative to a.
	weld.C0 = a.CFrame:inverse() * b.CFrame
	--Set the Part0 and Part1 properties respectively
	weld.Part0 = a
	weld.Part1 = b
	--Return the reference to the weld so that you can change it later.
	return weld
end


--- NOTE: if its r15 Torso is called LowerTorso or UpperTorso. In r6 its Torso. For simplicity lets use HumanoidRootPart

game.Players.PlayerAdded:connect(function(player)
	player.CharacterAdded:connect(function(character)

		local ChosenPart = ""-- place something that you want to weld to torso 
		weldBetween(ChosenPart,character("HumanoidRootPart")
	

	end)
end)