How Dialog for Hopperbin?

function onButton1Down(mouse)
	Instance.new("Dialog", Parent.Parent.Head)
	Dialog.Text = ("GRIM MAGIC!!!")
end
 
function onSelected(mouse)
	mouse.Button1Down:connect(function() onButton1Down(mouse) end)
end
script.Parent.Selected:connect(onSelected)

Help with the script making a dialog saying something. Help?

This may not be a full answer, but I'll help you out real quick.

function onButton1Down(mouse)
    local Dialog = Instance.new("Message", script.Parent.Parent.Head) --You can switch out Message with Hint if you like

    Dialog.Text =  "GRIM MAGIC!!!"
end