Top Menu > Apple Icon > About This Mac > Below Your OS Version (example: MacBook Pro (Retina, 15-inch, Early 2013))
Optional but would help Apple to identify the production lots with problems. Top Menu > Apple Icon > About This Mac
If you are filling this form is because you are having the Macbook screen stains problems. Nevertheless if you want to share additional and objective details about your problem please add them here
In case you have URL pictures please share them here