Help with changing a image's ImageRectOffset?

I want to change an image's ImageRectOffset when its parent (which is a billboardgui) is disabled. I thought it would be pretty simple but I don't know where I went wrong.

function test()
    if Billboardgui.Enabled == false then
        --wait()
        Billboardgui.Image.ImageRectOffset = Vector2(0,100)
    end
end