To get started, you'll need to be a subscriber or you'll need to create an account with Redbox using your credit card for access (just like Netflix); the good news is you get a one-month free trial to see if you want to stay on board.
Once you're set up, the home screen for the Redbox Instant app is laid out a lot like Netflix's, with thumbnails of movie posters sorted by category. Across the bottom of the screen are buttons to navigate to each section. You can browse movies by using a drop-down menu in the upper left to switch between genres and Redbox-curated collections. You can look at the My Redbox section, where you'll see your viewing history, movies you've bookmarked to watch later, and previous purchases. A locations button pinpoints all the Redbox locations in your area. There's also an account button where you can see how many rentals you have left for the month and a preferences section to restrict content if your child will be using the device.