How do I make the ImageButton work after clicking the ImageButton?

I added the ImageButton where it says function onButton1Down(mouse)But what happened, was that it did pop up, but instead the button didn't work after I clicked it and it didn't ger removed or destroyed after I clicked it. Also, on the last line for MouseButton1Down I don't know how to make it work either since I am using Instance.new()Please help me out here. I added the explanation to each of them using my knowledge as possible. This is the script:

local song1 = game.Workspace.BoxCD.song1 -- CD Model name
local disc1 = game.Workspace.PlainDisc.Decal -- Disc with Decal
local gui = game.StarterGui -- GUI
local screen = Instance.new("ScreenGui", gui) -- ScreenGUI
local image = Instance.new("ImageLabel", screen) --ImageLabel
local insert = Instance.new("ImageButton", screen) --ImageButton
touch = false -- Just another thing to add if I player touched it
inserted = false -- ImageButton says Insert, and it is like the touch = false but instead it inserts or change the decal of the CD

function onClicked(clicker)  -- Clicker clicked
    if not touch then -- If it is not touch then
        touch = true -- Make it true for touch
        local screen = Instance.new("ScreenGui", clicker.PlayerGui) --Screen gui and where it goes
        local image = Instance.new("ImageLabel", screen) -- ImageLabel  and where it goes
        local insert = Instance.new("ImageButton", screen) -- ImageButton and goes with screen
        image.Position = UDim2.new(0, 500, 0, 25)  --Position of the Image
        image.Size = UDim2.new(0, 450, 0, 500) -- Size of it
        image.Image = "rbxassetid://238387775" --Image ID 
        insert.Position = UDim2.new(0, 830, 0, 485) -- Insert as in ImageButton position
        insert.Size = UDim2.new(0, 120, 0, 40) -- ImageButton size
        insert.Image = "rbxassetid://70392447" --ImageButton Image Id
        touch = false -- And when everything is done with it, the touch is back to false
    end
end

function onButton1Down(mouse) --Clicking the ImageButton using the Mouse
    if not inserted then -- If it is not inserted then
        inserted = true -- Insert it
        disc1.Texture = "rbxassetid://238387775" --Changing the decal of the disc to this ID
        inserted = false -- And then it is done
        screen:Destroy() --Removes the screen gui 
        image:Destroy() -- Removes image
        insert:Destroy() -- removes the button
    end
end

script.Parent.ClickDetector.MouseClick:connect(onClicked)
script.Parent.MouseButton1Down:connect(onButton1Down) -- I am not sure how to use this part when the ImageButton and others happens to be `Instance.new`

OutPut: 21:34:31.556 - MouseButton1Down is not a valid member of UnionOperation 21:34:31.556 - Script 'Workspace.BoxCD.song1.Union.Song1', Line 35 21:34:31.557 - Stack End

The output is incredibly self explanatory - Unions do not have a MouseButton1Down event; only GUIs do. I'm assuming that this script is parented to the thing that's being clicked, going by the output.

Also, with your top paragraph - Could you perhaps explain what you're trying to do in a much clearer fashion? I've literally got no clue what you want or what you're trying to do.