how do i make a gui scrolling wheel? i've seen other games with it, but i don't know how to.

i'm trying to make a scrolling wheel for gui, example here (bottom right) i can script it in, i just don't know the basic steps on how i would do it. i tried ddoing a basic non scroll wheel version, but it didn't work

uis.InputBegan:Connect(function(input, gameProcessed)
	if input.KeyCode == 120 then
		--Up
		Frame.Position = Vector2.new(Frame.Position.X.Scale, Frame.Position.Y.Scale + 0.2)
	elseif input.KeyCode == 122 then
		--Down
		Frame.Position = Vector2.new(Frame.Position.X.Scale, Frame.Position.Y.Scale - 0.2)
	end
end)

please help!