Summarize this article:

Its app icon resembles a white star on a pink background. It's the magnifying glass icon at the bottom of the screen. You'll see this option at the top of the screen. Type in a movie's name, then tap Search in the keyboard. You can also type hindi or bollywood in here if you're not looking for a specific movie. You'll find this at the top of the screen. If you don't see this tab, tap the More tab, then tap Movies in the resulting menu. Tap the movie that you want to purchase. This will open its page. It's in the upper-right side of the page. You can also tap RENT to rent the movie if you don't want to buy it. Press your finger against the Touch ID sensor when prompted. This will purchase the movie. If you don't use Touch ID, you'll enter your Apple ID password when prompted instead. You may have to tap Buy again before doing so. Once the movie finishes downloading, you can watch it from the TV app, which comes pre-installed on all iPhones and iPads running iOS 10 or higher:  Open TV  Tap Library  Select your movie.

Summary:
Open the iTunes Store app. Tap Search. Tap the search bar. Search for a movie. Tap the Movies tab. Select a movie. Tap BUY. Enter your Touch ID. Wait for the movie to download.