How can I transform morph script which works by touching to works by clicking?

Just add a clickdetector to the part where you are going to wear when you click,put the script under to the clickdetector,and change it like that; Edit:Changed my mistakes.

Game.Players.PlayerAdded:Connect(function(plr)
local function onClicked(player)
local char = plr.CharacterAdded:Wait() or plr.Character
    local d = char:GetChildren() -- start of hat remover
    for i=1, #d do 
        if (d[i].className == "Accessory") then 
            d[i]:remove() 
        end 
    end -- end of hat remover
    if char:FindFirstChild("Humanoid") ~= nil and char:FindFirstChild("Face") == nil then
        local g = script.Parent.Parent.Face:clone()
        g.Parent = char
        local C = g:GetChildren()
        for i=1, #C do
            if C[i].className == "Part" or C[i].className == "UnionOperation" or C[i].className == "MeshPart" then
                local W = Instance.new("Weld")
                W.Part0 = g.Middle
                W.Part1 = C[i]
                local CJ = CFrame.new(g.Middle.Position)
                local C0 = g.Middle.CFrame:inverse()*CJ
                local C1 = C[i].CFrame:inverse()*CJ
                W.C0 = C0
                W.C1 = C1
                W.Parent = g.Middle
                g.Middle.Transparency = 1
            end
                local Y = Instance.new("Weld")
                Y.Part0 = hit.Parent.Head
                Y.Part1 = g.Middle
                Y.C0 = CFrame.new(0, 0, 0)
                Y.Parent = Y.Part0
        end

        local h = g:GetChildren()
        for i = 1, # h do
            h[i].Anchored = false
            h[i].CanCollide = false
        end

    end
end
end)

clickDetector.MouseClick:Connect(onClicked)

Might help you.