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Tap one of the tabs to select your category.   Tap the screen to show the playback controls. Tap the Pause button to pause the video and slide a finger across the bar at the bottom of the screen to adjust the volume. You can also skip between videos in a series by tapping the forward and back buttons

Summary:
Tap the Videos icon on your iPad’s Home screen to launch the Videos app. Tabs are shown at the top of the screen, for Movies, TV Shows, Podcasts and Music Videos. Tap the title of the podcast or TV show episode you want to watch (for movies and music videos, skip to the next step). Tap the title of the video you want to watch. The video begins playing on your iPad. Slide a finger across the bar at the top to skip forward and back in the video. You can stream the video via AirPlay by tapping the AirPlay button (rectangle with an arrow) and selecting an available device. To stop watching the Video, tap the Done button.