Netflix offers a convenient My List feature that lets you save titles of movies and shows that you want to remember to watch later. If you happen to be browsing Netflix on your iPhone or iPad, you can easily add shows to your watch later list in just a few taps.
That's all there is to it. That particular item should have been added to your My List section of Netflix which you can access from the Home screen of the app. It will be the very first collection in the main menu. Your list will also synchronize across any Netflix enabled device so you can easily access it no matter what device you're on.