How to make the spell useable with no wand?

This script is "glacius" which freezes the target with the use of a wand but I don't want to use the wand with this. Instead I want the player to just tap a target and they will freeze. Is that possible?? If so can someone help me!!

local char = script.Parent
if char:FindFirstChild("Ice")==nil and char:FindFirstChild("Rock")==nil then
    for _,v in next,char:GetDescendants() do
        if v:IsA("BasePart") and v:FindFirstAncestorOfClass("Tool") == nil then
            v.Anchored=true
            if v.Name~="HumanoidRootPart" and v.Name ~= "Effect" then
                local r=v:clone()
                r.Anchored=false
                r.Name="Ice"
                r.BrickColor=BrickColor.new("Baby blue")
                r.Material=Enum.Material.Ice
                r.Size=v.Size+Vector3.new(.05,.05,.05)
                r.Transparency = .55
                local Weld = Instance.new("Weld")
                Weld.Part0 = v
                Weld.Part1 = r
                Weld.Parent = r
                r.Parent=char
                v.Transparency = 0
            end
        end
    end
    wait(math.random(5,12))
    for _,v in next,char:GetDescendants() do
        if v:IsA("BasePart") and v:FindFirstAncestorOfClass("Tool") == nil then
            v.Anchored=false
            if v.Name~="HumanoidRootPart" then
                if v.Name=="Ice" then
                    v:Destroy()
                else
                    v.Transparency=0
                end
            end
        end
    end
end
--
wait()
script:Destroy()